public static void main ( String args [ ] ) {
  Scanner in = new Scanner ( System . in ) ;
  int t ;
  t = in . nextInt ( ) ;
  for ( int j = 0 ;
  j < t ;
  j ++ ) {
    int n ;
    n = in . nextInt ( ) ;
    int sum1 = 0 , sum2 = 0 ;
    sum1 += Math . pow ( 2 , n ) ;
    for ( int i = 1 ;
    i < n / 2 ;
    i ++ ) {
      sum1 += Math . pow ( 2 , i ) ;
    }
    for ( int i = n / 2 ;
    i < n ;
    i ++ ) {
      sum2 += Math . pow ( 2 , i ) ;
    }
    System . out . println ( sum1 - sum2 ) ;
  }
}

public static void main ( String args [ ] ) { Scanner in = new Scanner ( System . in ) ; int t ; t = in . nextInt ( ) ; for ( int j = 0 ; j < t ; j ++ ) { int n ; n = in . nextInt ( ) ; int sum1 = 0 , sum2 = 0 ; sum1 += Math . pow ( 2 , n ) ; for ( int i = 1 ; i < n / 2 ; i ++ ) { sum1 += Math . pow ( 2 , i ) ; } for ( int i = n / 2 ; i < n ; i ++ ) { sum2 += Math . pow ( 2 , i ) ; } System . out . println ( sum1 - sum2 ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier)))))))))