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A217816
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, 272, 6531, 194062, 6720714, 261538316, 11157463902
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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:
A197458
A050974
A012188
*
A000182
A009764
A189257
Adjacent sequences:
A217813
A217814
A217815
*
A217817
A217818
A217819
KEYWORD
nonn
,
more
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 September 14 03:52 EDT 2024. Contains 375911 sequences. (Running on oeis4.)