

A217819


Number of alternating permutations on 2n letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).


0




OFFSET

1,2


LINKS

Table of n, a(n) for n=1..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: A298689 A217817 A217818 * A132618 A192562 A060080
Adjacent sequences: A217816 A217817 A217818 * A217820 A217821 A217822


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane, Oct 13 2012


EXTENSIONS

a(7)a(8) from Lars Blomberg, Feb 28 2018


STATUS

approved



