A217812 - OEIS

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A217812

Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

0

1, 2, 16, 243, 5291, 144430, 4601223, 164005785, 2072049543

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..8.

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

CROSSREFS

Cf. A181197, A217799-A217830.

Sequence in context: A203418 A207082 A207176 * A217813 A217814 A217815

Adjacent sequences: A217809 A217810 A217811 * A217813 A217814 A217815

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 13 2012

EXTENSIONS

a(6)-a(8) from Lars Blomberg, Feb 22 2018

STATUS

approved