id:A088142 - OEIS Search Results

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Number of partitions of n-set with 2 block sizes.

+0
4

3, 10, 50, 116, 560, 1730, 6123, 30122, 116908, 507277, 2492737, 15328119, 56182092, 441156796, 2093130576, 15965840718, 77353276330, 693400983344, 3517825829117, 35126205660152, 187347585491624, 1952969742765476 (list; graph; listen)

	OFFSET	`3,1`
	FORMULA	`E.g.f.: (G(x)^2-H(x))/2 where G(x) = Sum {k>=1} (exp(x^k/k!)-1) and H(x) = Sum {k>=1} (exp(x^k/k!)-1)^2. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 18 2007`
	CROSSREFS	`Cf. A005772, A038041, A002133.` `Sequence in context: A082426 A054381 A102088 this_sequence A049370 A009343 A048175` `Adjacent sequences: A088139 A088140 A088141 this_sequence A088143 A088144 A088145`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Nov 02 2003`

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Last modified September 4 21:24 EDT 2008. Contains 143414 sequences.

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