Problem 1393. A (wrong) place for everything, and everything in its (wrong) place
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2 Comments
Jean-Marie Sainthillier
on 8 Apr 2013
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.
Binbin Qi
on 27 Oct 2014
http://oeis.org/A000166
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