Try:
Console.WriteLine("1");
Console.WriteLine("1 2 1");
Console.WriteLine("1 2 3 2 1");
Console.WriteLine("1 2 3 4 3 2 1");
Console.WriteLine("1 2 3 4 5 4 3 2 1");
If you mean "Please write the code to do this dynamically so I get a job I don't deserve and can't do", then I really think you should write it yourself, as if you can't I for one do not want to work next to you!