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A217807
Number of alternating permutations on 2n letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).
0
1, 4, 29, 292, 3620, 51866, 827415, 14350467, 266218320
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..9.
Andrew R. Conway, Anthony J. Guttmann, Paul Zinn-Justin,
1324-avoiding permutations revisited
arXiv:1709.01248 [math.CO], 2017.
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:
A302586
A302609
A181197
*
A348651
A360584
A127770
Adjacent sequences:
A217804
A217805
A217806
*
A217808
A217809
A217810
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Oct 12 2012
EXTENSIONS
a(7)-a(9) from
Lars Blomberg
, Feb 17 2018
STATUS
approved
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Last modified April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)