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A279201 Number of Wilf-equivalence classes of square permutations of 2n things that avoid 123. 1
1, 2, 12, 118, 1218, 14272 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Samuele Giraudo, S. Vialette, Unshuffling Permutations, arXiv preprint arXiv:1601.05962 [cs.DS], 2016.
CROSSREFS
Sequence in context: A012628 A012623 A009742 * A121425 A132692 A009546
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Dec 15 2016
STATUS
approved

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Last modified July 17 22:17 EDT 2024. Contains 374377 sequences. (Running on oeis4.)