C++ :

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>

using namespace std;
long long int a[20]={1,2,5,14,42,132,429,1430,4862,16796,58786,208012,742900,2674440,9694845,35357670,129644790,477638700,1767263190,6564120420}; 

int main()
{
	int n;
	while(scanf("%d",&n)==1)
	{
		cout << a[n-1] << endl;
	}
	return 0;
}