

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




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: A265132 A080446 A301411 * A177409 A212273 A055897
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



