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A036980
Number of (2n) X (2n) symmetric matrices each of whose rows is a permutation of 1..(2n).
2
1, 2, 96, 328320, 440952422400
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..4.
FORMULA
a(n) =
A035483
(n) * (2n)!
CROSSREFS
Cf.
A035481
,
A036981
.
Sequence in context:
A064069
A065128
A122222
*
A337653
A168442
A091810
Adjacent sequences:
A036977
A036978
A036979
*
A036981
A036982
A036983
KEYWORD
more
,
nonn
AUTHOR
Joshua Zucker
and Joe Keane
STATUS
approved
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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)