id:A007060 - OEIS Search Results

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Number of ways n couples can sit in a row without any spouses next to each other.

+0
2

1, 0, 8, 240, 13824, 1263360, 168422400, 30865121280, 7445355724800, 2287168006717440, 871804170613555200, 403779880746418176000, 223346806774106790297600, 145427383048755178635264000 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`Eric Weisstein's World of Mathematics, Cocktail Party Graph` `Eric Weisstein's World of Mathematics, Hamiltonian Path`
	MAPLE	`sum((-1)^ibinomial(n, i)(2^iabs((2n-i))!), i=0..n);`
	CROSSREFS	`Adjacent sequences: A007057 A007058 A007059 this_sequence A007061 A007062 A007063` `Sequence in context: A134504 A145418 A067360 this_sequence A158263 A115613 A085524`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`David.Roberts.Keeney(AT)directory.Reed.EDU (David Roberts Keeney)`
	EXTENSIONS	`More terms from Michel ten Voorde (seqfan(AT)tenvoorde.org) Apr 11 2001`

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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