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A217815
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, 5330, 148764, 4937012, 186936427, 7857183636
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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:
A217812
A217813
A217814
*
A192325
A009233
A188560
Adjacent sequences:
A217812
A217813
A217814
*
A217816
A217817
A217818
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 March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)