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A217820 Number of alternating permutations on 2n letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition). 0
1, 5, 61, 1194, 30802, 953088, 33563745, 1302192441 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..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: A083082 A213110 A298695 * A217821 A009825 A065919

Adjacent sequences:  A217817 A217818 A217819 * A217821 A217822 A217823

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 13 2012

EXTENSIONS

a(7)-a(8) from Lars Blomberg, Feb 28 2018

STATUS

approved

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Last modified August 10 11:12 EDT 2020. Contains 336379 sequences. (Running on oeis4.)