Numbers Triangle 2

using System;
using System.Collections.Generic;

namespace NumbersTriangle
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            for (int i = 1; i <= n; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write(j);

                }
                Console.WriteLine();
            }
            for (int i = 1; i < n; i++)
            {
                for (int j = n-i; j >= 1; j--)
                {
                    List<int> arr = new List<int>();
                    arr.Add(j);
                    arr.Reverse();

                    for (int u = 0; u < arr.Count; u++)
                    {
                        Console.Write(arr[u]);
                    }

                }
                Console.WriteLine();
            }

        }
    }
}