id:A001052 - OEIS Search Results

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a(n) = n(n-1)a(n-1)/2 + a(n-2).
(Formerly M0911 N0343)

+0
2

1, 2, 3, 11, 69, 701, 10584, 222965, 6253604, 225352709, 10147125509, 558317255704, 36859086001973, 2875567025409598, 261713458398275391, 27482788698844325653, 3298196357319717353751, 448582187384180404435789 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) a(n)=if(n<2, max(0, n+1), n(n-1)a(n-1)/2+a(n-2))`
	CROSSREFS	`Sequence in context: A105217 A066046 A065597 this_sequence A109132 A008510 A042165` `Adjacent sequences: A001049 A001050 A001051 this_sequence A001053 A001054 A001055`
	KEYWORD	`nonn,easy`
	AUTHOR	`njas`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Sep 19 2000`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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