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A036980 (2n)x(2n) symmetric matrices each of whose rows is a permutation of 1..(2n). +0
3
1, 2, 96, 328320, 440952422400 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Cf. A035481, A036981.

Sequence in context: A064069 A065128 A122222 this_sequence A091810 A165642 A057528

Adjacent sequences: A036977 A036978 A036979 this_sequence A036981 A036982 A036983

KEYWORD

more,nonn

AUTHOR

Joshua Zucker and Joe Keane (joshua.zucker(AT)stanfordalumni.org)

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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