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A217803
Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).
0
1, 2, 12, 108, 1202, 15234, 210696, 3102296, 47875884
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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:
A265132
A080446
A301411
*
A177409
A360950
A212273
Adjacent sequences:
A217800
A217801
A217802
*
A217804
A217805
A217806
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Oct 12 2012
EXTENSIONS
a(6)-a(8) from
Lars Blomberg
, Jan 23 2018
STATUS
approved
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Last modified April 25 13:22 EDT 2024. Contains 371969 sequences. (Running on oeis4.)