A036980 - OEIS

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A036980

(2n)x(2n) symmetric matrices each of whose rows is a permutation of 1..(2n).

1, 2, 96, 328320, 440952422400 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n) = A035483(n) * (2n)!`
	CROSSREFS	`Cf. A035481, A036981.` `Sequence in context: A064069 A065128 A122222 * A168442 A091810 A165642` `Adjacent sequences: A036977 A036978 A036979 * A036981 A036982 A036983`
	KEYWORD	`more,nonn`
	AUTHOR	`Joshua Zucker and Joe Keane (joshua.zucker(AT)stanfordalumni.org)`

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Last modified February 16 12:41 EST 2012. Contains 205909 sequences.