using System; 

class Program 

{ 

    static void Main() 

    { 

        Console.Write("Ingrese el numero de filas : "); 

        int n = Convert.ToInt32(Console.ReadLine()) ;

        for (int i = 1 ; i <= n; i++)

        {

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

            {

                Console.Write(" ");

            }

            for (int k =1; k <= (2 * i - 1); k++ )

            {

                Console.Write("*");

            }

            Console.WriteLine();

        }

    }

}

​