

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




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, A217799A217830.
Sequence in context: A217812 A217813 A217814 * A192325 A009233 A188560
Adjacent sequences: A217812 A217813 A217814 * A217816 A217817 A217818


KEYWORD

nonn,more,changed


AUTHOR

N. J. A. Sloane, Oct 13 2012


EXTENSIONS

a(6)a(8) from Lars Blomberg, Feb 22 2018


STATUS

approved



