A217810 - OEIS

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A217810

Number of alternating permutations on 2n letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).

0

1, 5, 42, 454, 5680, 78129

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..6.

J. B. Lewis,Pattern Avoidance for Alternating Permutations and Reading Words of Tableaux,Ph. D. Dissertation, Department of Mathematics, MIT, 2012. See Table A.2.

CROSSREFS

Cf.A181197,A217799-A217830.

Sequence in context:A024492 A217805 A217808*A151334 A005789 A217809

Adjacent sequences:A217807 A217808 A217809*A217811 A217812 A217813

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane,Oct 13 2012

EXTENSIONS

Data corrected byAndrew Howroydafter observation byGionata Neri,May 02 2020

STATUS

approved