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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
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..5.
Samuele Giraudo, S. Vialette,
Unshuffling Permutations
, arXiv preprint arXiv:1601.05962 [cs.DS], 2016.
CROSSREFS
Cf.
A279200
,
A279202
,
A279203
.
Sequence in context:
A012628
A012623
A009742
*
A121425
A132692
A009546
Adjacent sequences:
A279198
A279199
A279200
*
A279202
A279203
A279204
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Dec 15 2016
STATUS
approved
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Last modified August 19 20:07 EDT 2024. Contains 375310 sequences. (Running on oeis4.)