I think that with this kind of problem, you can process in two steps.
A first easy problem with small N (to test perms for example). And a harder problem with big N, which
oblige to find another algorithm.
http://oeis.org/A000166
9982 Solvers
717 Solvers
Reverse the Words (not letters) of a String
298 Solvers
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230 Solvers
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