Update Main

Updated with a new method: uniqueCombinations. This method I have figured out myself after some calculations. It is as far as I know, not existing anywhere else on the web. You can use if you want (please refer to where), especially since it isn't tested by anyone but myself. Have tested it mathematically with the number 'n' and it worked. To do this evidence you have to work with factorial numbers. The other method for calculating the same thing (uniqueCombinations2), can only take numbers 0 <= n <= 20. uniqueCombinations is can handle much bigger numbers, though it still breaks since it's a recursive method.

Joppe