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A217813 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, 5307, 146013, 4711578, 170831459, 6770004407 (list; graph; refs; listen; history; text; internal format)
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: A207082 A207176 A217812 * A217814 A217815 A192325

Adjacent sequences:  A217810 A217811 A217812 * A217814 A217815 A217816

KEYWORD

nonn,more,changed

AUTHOR

N. J. A. Sloane, Oct 13 2012

EXTENSIONS

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

STATUS

approved

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Last modified October 18 20:10 EDT 2018. Contains 316325 sequences. (Running on oeis4.)