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A279200
Number of square permutations of 2n things.
3
1, 2, 20, 504, 21032, 1293418
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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.
EXAMPLE
The 20 square permutations of order 4 are 1234, 1243, 1423, 1324, 1342, 4132, 3124, 3142, 3412, 4312, 2134, 2143, 2413, 4213, 2314, 2431, 4231, 3241, 3421, 4321.
CROSSREFS
Cf.
A191755
(square binary words).
Sequence in context:
A012340
A279839
A279837
*
A277414
A296789
A168136
Adjacent sequences:
A279197
A279198
A279199
*
A279201
A279202
A279203
KEYWORD
nonn
,
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AUTHOR
N. J. A. Sloane
, Dec 15 2016
STATUS
approved
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Last modified August 19 19:55 EDT 2024. Contains 375310 sequences. (Running on oeis4.)