id:A108189 - OEIS Search Results

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a(n) = (n-1)*(a(n-2)+a(n-3))

+0
1

0, 1, 1, 3, 8, 20, 66, 196, 688, 2358, 8840, 33506, 134376, 550498, 2350348, 10273110, 46413536, 214598786, 1020359628, 4959234118, 24699168280, 125571468666, 652484852756, 3456224649758, 18673351714128, 102717737562850 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`Derangement-type sequence like A000166 on A000931.`
	MATHEMATICA	`F[1] = 0; F[2] = 1; F[3] = 1; F[n__] := F[n] = (n - 1)*( F[n - 2] + F[n - 3]) a = Table[F[n], {n, 1, 25}]`
	CROSSREFS	`Cf. A000166, A000213, A000931.` `Sequence in context: A122228 A018790 A009436 this_sequence A110861 A027320 A027319` `Adjacent sequences: A108186 A108187 A108188 this_sequence A108190 A108191 A108192`
	KEYWORD	`nonn`
	AUTHOR	`Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 14 2005`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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