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A217821
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, 30945, 970717, 35033427, 1408275466
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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:
A352238
A349715
A217820
*
A009825
A065919
A196125
Adjacent sequences:
A217818
A217819
A217820
*
A217822
A217823
A217824
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 November 28 17:03 EST 2023. Contains 367419 sequences. (Running on oeis4.)