using System;

using System.Collections.Generic;   

​

public class Program

{

    public class     arbol{    public string rama; }

    public static void Main()

    { 

     var objeto  = new  List<arbol>();

        var c=150;

        var indexOf = (c/2)+1;

        for(var i =1; i <= 20; i++){

            var xentidad   = new arbol();

            xentidad.rama =  string.Format("rama: {0}",i);

            var space = "";

            space = space + string.Format("{0}","".PadLeft(c, '.'));

            //System.Console.WriteLine(space);

            indexOf = indexOf -1;

            var countQuit =  i == 1 ? 1 : (i*2) -1 ;

            var pin = "*".PadLeft(countQuit,'*');

            //System.Console.WriteLine(string.Format("{0}: {1}:  {2}", indexOf, countQuit,pin));

            space = space.Remove(indexOf,countQuit).Insert(indexOf,pin);

            System.Console.WriteLine(space);

        }

    }

}