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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It would be really nice if you added some test cases :)
The tests aren't sufficient to detect cheaters: http://www.codewars.com/kata/reviews/5500541bbe7d059c90000374/groups/552968f46cc659943200030d
Did you mean "to make it more elegant" maybe? Also I think this example in the description:
factorial(3)/321 = 6is missing a*sign, plus you could use better formatting, like starting each sentence with a capital letter.Otherwise good job.