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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
J. B. Lewis, Pattern Avoidance for Alternating Permutations and Reading Words of Tableaux, Ph. D. Dissertation, Department of Mathematics, MIT, 2012.
CROSSREFS
Sequence in context: A217812 A217813 A217814 * A192325 A009233 A188560
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.)