A035483 - OEIS

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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.

1, 1, 4, 456, 10936320 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`a(n) = A035481(2*n). [From Max Alekseyev (maxale(AT)gmail.com), Apr 23 2010]`
	CROSSREFS	`Cf. A000438, A035481, A000315, A002860, A003090, A040082.` `Sequence in context: A159514 A034985 A104690 * A145570 A053292 A053963` `Adjacent sequences: A035480 A035481 A035482 * A035484 A035485 A035486`
	KEYWORD	`more,nonn,nice`
	AUTHOR	`Joshua Zucker and Joe Keane (joshua.zucker(AT)stanfordalumni.org)`

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.