A036981 - OEIS

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A036981

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

1, 6, 720, 31449600, 444733651353600, 10070314878246926155776000, 614972203951464612786852376432607232000 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Number of different schedules for 2n+2 teams. - Andres Cardemil (andrescarde(AT)yahoo.com), Nov 28, 2001`
	LINKS	`Index entries for sequences related to tournaments`
	FORMULA	`a(n) = A000438(n+1) * (2*n+1)!`
	CROSSREFS	`Cf. A035481, A036980, A000474, A064120, A065594. A000438.` `Sequence in context: A168467 A169668 A080369 * A202080 A130688 A088217` `Adjacent sequences: A036978 A036979 A036980 * A036982 A036983 A036984`
	KEYWORD	`nonn,more`
	AUTHOR	`Joshua Zucker and Joe Keane (joshua.zucker(AT)stanfordalumni.org)`
	EXTENSIONS	`Two more terms computed from A000438 by Max Alekseyev (maxale(AT)gmail.com), Jun 17 2011`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.