10 Catalan Numbers

using System;
using System.Numerics;

class CatalanNumber
{
    static void Main()
    {
        Console.Write("n = ");
        uint n = uint.Parse(Console.ReadLine());
        BigInteger numerator = 1;
        BigInteger denominator = 1;
        for (uint i = 2; i <= n; i++)
        {
            numerator *= (n + i);
            denominator *= i;
        }
        Console.WriteLine("Catalan number for n={0} is {1}",n,numerator/denominator);
    }
}