Driver Code
int main ( ) { long int n = 3 ; cout << n << " th ▁ number ▁ : ▁ " << center_pentadecagonal_num ( n ) ; cout << endl ; n = 10 ; cout << n << " th ▁ number ▁ : ▁ " << center_pentadecagonal_num ( n ) ; return 0 ; }