using System;  

public class Exercise13 

{  

    public static void Main()

{

   int a,i,g,rows,j,t=1;   

   Console.Write("input number of rows : ");

   rows= Convert.ToInt32(Console.ReadLine());    

   g=rows+4-1;

   for(a=1;a<=rows;a++)

   {

         for(j=g;j>=1;j--)

            {

              Console.Write(" ");

            }

       for(i=1;i<=a;i++)

       Console.Write("{0} ",t++);

    Console.Write("\n");

    g--;

   }

}

}

​