public static int countP ( int n , int k ) {
  if ( n == 0 || k == 0 || k > n ) return 0 ;
  if ( k == 1 || k == n ) return 1 ;
  return ( k * countP ( n - 1 , k ) + countP ( n - 1 , k - 1 ) ) ;
}

public static int countP ( int n , int k ) { if ( n == 0 || k == 0 || k > n ) return 0 ; if ( k == 1 || k == n ) return 1 ; return ( k * countP ( n - 1 , k ) + countP ( n - 1 , k - 1 ) ) ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (return_statement (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (return_statement (decimal_integer_literal))) (return_statement (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)) (identifier)))) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)) (binary_expression left: (identifier) right: (decimal_integer_literal)))))))))