id:A078480 - OEIS Search Results

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Number of permutations p of {1,2,...,n} such that |p(i)-i| != 1 for all i.

+0
2

1, 1, 1, 2, 5, 21, 117, 792, 6205, 55005, 543597, 5922930, 70518905, 910711193, 12678337945, 189252400480, 3015217932073, 51067619064873, 916176426422089, 17355904144773970, 346195850534379613, 7252654441500887309 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`G.f.: 1/(1-x^2)Sum_{n>=0} n!(x/(1+x)^2)^n. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Jun 26 2007`
	CROSSREFS	`Cf. A000179, A000271.` `Sequence in context: A002628 A020129 A129582 this_sequence A139153 A144271 A117261` `Adjacent sequences: A078477 A078478 A078479 this_sequence A078481 A078482 A078483`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Jan 03 2003`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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