A217816 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A217816

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, 272, 6531, 194062, 6720714, 261538316, 11157463902

(list; graph; refs; listen; history; text; internal format)

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: A197458 A050974 A012188 * A000182 A009764 A189257

Adjacent sequences: A217813 A217814 A217815 * A217817 A217818 A217819

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 13 2012

EXTENSIONS

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

STATUS

approved