static int sum_series ( int n ) {
  int nSquare = n * n ;
  return nSquare * ( nSquare - 1 ) / 4 ;
}

static int sum_series ( int n ) { int nSquare = n * n ; return nSquare * ( nSquare - 1 ) / 4 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (return_statement (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal)))))