public ActionResult Index(SequenceViewModel model)
        {
            model.allNumbers = String.Join(", ", GetAllNumbers(model.input));
            model.evenNumbers = String.Join(", ", GetEvenNumbers(model.input));
            model.oddNumbers = String.Join(", ", GetOddNumbers(model.input));
            model.fizzBuzzNumbers = String.Join(", ", GetFizzBuzzNumbers(model.input));
            model.fibonacciNumbers = String.Join(", ", GetFibonacciNumbers(model.input));

            return View(model);
        }
        public ActionResult Index()
        {
            var model = new SequenceViewModel();

            return View(model);
        }