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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.
Usually problems are related to overflow, and you can verify this by comparing your results to, for example, results returned by Wolfram: https://www.wolframalpha.com/input/?i=binomial%2860%2C30%29 .
Run your solution locally for n=60, dump the answer to the console, and check numbers in the middle of the row, because these are the largest: (59 28), (60 30) etc.
It's possible that your calculations either overflow, or are inaccurate due to floating point division.