using System;

​

public class Program

{

    public static void Main()

    {

        //Please change the parameter to a number less than 10

        PascalTriangle(1);

    }

​

    // factorial

    static int fact(int n)

    {

        int x = 1;

        while (n > 1)

        {

            x = x * n;

            n = n - 1;

        }

​

        return x;

    }

​

    // combinations

    static int comb(int n, int r)

    {

        int x = fact(n) / (fact(n - r) * fact(r));

        return x;

    }

​

    // Pascal's triangle

    static void PascalTriangle(int n)

    {

        string y = "";

        string space = "";

        string sp = "";

        for (int i = 0; i < n; i++)

        {

            if (i == 0)

            {

                space = new string (' ', (3 * n + 1) - 3 * i);

            }

            else

            {

                space = new string (' ', (3 * n) - 3 * i);

            }

​

            for (int j = 0; j <= i; j++)

            {

                sp = new string (' ', 5);

                y += comb(i, j).ToString() + sp;

            }

​

            Console.Write(space + y + " ");

            y = " ";

            Console.WriteLine();

        }

    }

}