To be fair I mainly follow PEP8 because it's a good (imo) way to make my code more readable

In my defence, this is the first time I've ever heard of PEP-8.

here we go again, not following PEP-8

would someone mind explaining as to how lambda is used in this as well as what reduce does?.
much appreciated.

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).

c++ translation???

Both approved, thanks.

Can't to approve due to a conflict in the description.
Forks with the correct description for COBOL and Go.

Oh god. I think it isnt 7 kyu

C Translation (author inactive).

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Cannot reproduce. The reference solution and the solution provided by the author both return [0, 18, 2] for this input.