C#-Code

using System;
using static System.Console;

using System.Numerics;

namespace aufgabe_191
{
    class Program
    {
        static string NL = Environment.NewLine;
        static void Main()
        {
            bool bo_again = true;
            while (bo_again)    {

                WriteLine();
                int z = 0;                  //Anzahl unterschiedlicher Objekte (hier max 99, sonst wird es zu unübersichtlich,
                                            //ist aber prinzipiell unbeschränkt)
                bool bo_input_ok = false;
                while (!bo_input_ok)    {
                    string input = "give me count of objects (1 ... 99): ".ReadValue();
                    bo_input_ok = int.TryParse(input, out z);
                    if ((z < 1) || (z > 99))
                        bo_input_ok = false;
                }

                BigInteger bmax = BigInteger.Pow((BigInteger)z, z);
                ("max possible object arrangements: " + bmax.ToString("E1") + "  exact: " + bmax.ToString("n0")).MessageLine();

                BigInteger bvalue = 0;
                bo_input_ok = false;
                while (!bo_input_ok)    {
                    string input = ("take an example (0 ... " + (bmax - 1).ToString("E1") + "): ").ReadValue();
                    bo_input_ok = BigInteger.TryParse(input, out bvalue);
                    if (bvalue > bmax - 1)
                        bo_input_ok = false;
                }

                (z.value_for_this_basis(bvalue).BIArrayToString() + NL + "= " +
                    z.value_for_this_basis(bvalue).cut_leading_zeros().BIArrayToString() + " (BASE " + z.ToString() + ")").MessageLine();
                bo_again = !("press key: again (all except ESC) or EXIT (ESC)".Readkey().Key == ConsoleKey.Escape);
            }
        }
    }

    static class MyExtensions
    {
        public static void MessageLine(this string info) => WriteLine(info);

        public static string ReadValue(this string intro)        {
            Write(intro); return ReadLine();
        }

        public static ConsoleKeyInfo Readkey(this string intro)        {
            Write(intro);
            ConsoleKeyInfo ki = ReadKey(true);
            return ki;
        }

        //__ Hauptmethode
        public static BigInteger[] value_for_this_basis(this int basis, BigInteger dec_value)
        {
            BigInteger[] result = new BigInteger[basis];
            int array_pos = result.Length - 1;

            for(int i = 0; i < result.Length; i++)  {
                BigInteger rest = dec_value % basis;
                result[array_pos--] = rest;                
                dec_value /= basis;
            }
            return result;
        }
        //__

        public static BigInteger[] cut_leading_zeros(this BigInteger[] value)
        {
            System.Collections.Generic.List<BigInteger> L = new System.Collections.Generic.List<BigInteger>();
            bool bo_found_first_not_zero = false;
            for(var i = 0; i < value.Length; i++)
            {
                if(value[i] != 0)
                    bo_found_first_not_zero = true;
                if (bo_found_first_not_zero)
                    L.Add(value[i]);
            }
            return L.ToArray();
        }

        public static string BIArrayToString(this BigInteger[] bia)
        {
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            for (var i = 0; i < bia.Length; i++)
                sb.Append(bia[i].ToString("n0") + " ");
            return sb.ToString();
        }
    }
}