How many ways are there to seat $n$ couples around a circular table such that no couple sits next to each other?

I know that since there are $n$ couples, there are $2n$ people.

I need to use Inclusion-Exclusion. However I am unsure of how to go about this problem.


marked as duplicate by Don Thousand, Parcly Taxel, Lord Shark the Unknown, ArsenBerk, Scientifica Oct 31 '18 at 8:25

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