static void Recursive(char ch, int n, byte space)
        {

            for (var i = 0; i <= n; i++)
            {
                Console.Write(ch);
            }
            Console.WriteLine();
            if (ch != 90)
            {
                for (int i = 0; i < space; i++)
                {
                    Console.Write(' ');
                }
            }
            if (ch == 90)
            {
                return;
            }
            else Recursive((char)(ch+1), n -2, ++space);
            if (ch == 89)
            {
                for (int i = 1; i < space-1; i++)
                {
                    Console.Write(' ');
                }
            }
            for (int i = n ; i >= 0; i--)
            {
                Console.Write((char)(ch));
            }
            Console.WriteLine();
            for (int i = 0; i < space-3 ; i++)
            {
                Console.Write(' ');
            }


        }
        public static void Main(string[] arg)
        {
            Recursive('A', 50, 1);
            Console.ReadKey();
        }