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A035483 2n X 2n symmetric matrices whose first row is 1..2n and whose rows and columns are all permutations of 1..2n. +0
3
1, 1, 4, 456, 10936320 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Cf. A000438, A035481, A000315, A002860, A003090, A040082.

Sequence in context: A159514 A034985 A104690 this_sequence A145570 A053292 A053963

Adjacent sequences: A035480 A035481 A035482 this_sequence A035484 A035485 A035486

KEYWORD

more,nonn,nice

AUTHOR

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

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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