[seqfan] Observation on A165961- Number of circular permutations of length n without 3-sequences

David Scambler dscambler at bmm.com
Mon Mar 28 04:37:40 CEST 2011

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A165961<https://oeis.org/A165961> Number of circular permutations of length n without 3-sequences.

Apparently also permutations of length n-1 without consecutive fixed points.

Is this known? Obvious?

dave

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