static int center_octadecagon_num ( int n ) {
  return 9 * n * n - 9 * n + 1 ;
}

static int center_octadecagon_num ( int n ) { return 9 * n * n - 9 * n + 1 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (return_statement (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (identifier)) right: (identifier)) right: (binary_expression left: (decimal_integer_literal) right: (identifier))) right: (decimal_integer_literal)))))