Loading collection data...
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.
I don't know if your code is correct, but you must find a way to do the calculation without computing
n!!, because this is a very expensive operation; moreover in some languages (like JS) ordinary numbers cannot hold such huge values (which may be the reason of your code failure).This comment is hidden because it contains spoiler information about the solution