using System;  

public class Exercise13 

{  

    public static void Main()

{   

    int x,y,z,n;

    int k=1;

    //n=Convert.ToInt16(Console.ReadLine());

    n=4;

    for(x=1;x<=n;x++)

    {

        for(y=1;y<=n-x;y++)

        { Console.Write(" "); }

        for(z=1;z<=x;z++)

        { Console.Write(k++ + " "); }

        Console.WriteLine("");

    }       

}

}

​