using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var inputValue = 5;

​

        var solution = new Solution();

        var arr = solution.PrettyPrint(inputValue);

​

        foreach (var arrRow in arr)

        {

            Console.WriteLine();

            foreach (var arrColumn in arrRow)

            {

                Console.Write(arrColumn);

            }

        }

​

        Console.ReadLine();

    }

}

​

    /// <summary>

    /// Solution

    /// </summary>

public class Solution

    {

        /// <summary>

        /// Pretties the print.

        /// </summary>

        /// <param name="A">a.</param>

        /// <returns></returns>

        public List<List<int>> PrettyPrint(int A)

        {

            var num = A * 2 - 1;

            var arr = new int[num, num];

            FillArray(0, A, arr);

​

            var result = new List<List<int>>();

            for (var i = 0; i < arr.GetLength(0); i++)

            {

                var list = new List<int>();

                for (var j = 0; j < arr.GetLength(0); j++)

                {

                    list.Add(arr[i,j]);

                }

                result.Add(list);

            }

            return result;

        }

​

        /// <summary>

        /// Fills the array.

        /// </summary>

        /// <param name="level">The level.</param>

        /// <param name="maxLevel">The maximum level.</param>

        /// <param name="arr">The arr.</param>

        private void FillArray(int level, int maxLevel, int[,] arr)

        {

            if (level >= maxLevel)

                return;

            var value = maxLevel - level;

            for (var i = level; i < arr.GetLength(0)-level; i++)

            {

                var leftAndTopCornerIndex = level;

                arr[leftAndTopCornerIndex, i] = value;

                arr[i, leftAndTopCornerIndex] = value;

​

                var rightAndButtomCornerIndex = arr.GetLength(0) - level - 1;

                arr[rightAndButtomCornerIndex, i] = value;

                arr[i, rightAndButtomCornerIndex] = value;

            }

​

            FillArray(level + 1, maxLevel, arr);

        }

    }