id:A093377 - OEIS Search Results

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Number of labeled n-vertex graphs without 2-components and without isolated vertices(1-components).

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1, 0, 0, 4, 38, 728, 26864, 1871576, 251762204, 66308767200, 34497665550400, 35641856042561008, 73354660691960203016, 301272244237002052739424, 2471648864359822034978330304, 40527681073171940835893232576032 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Also number of unlabeled n-block ordered r-bicoverings, cf. A060053. - Vladeta Jovovic (vladeta(AT)eunet.rs), May 13 2004`
	FORMULA	`E.g.f. exp(-x-x^2/2)Sum(2^binomial(n, 2)x^n/n!, n=0..infinity). Inverse binomial transform of A093352().`
	CROSSREFS	`Cf. A006129, A093351, A093352.` `Sequence in context: A084285 A084286 A001187 this_sequence A131591 A030259 A018860` `Adjacent sequences: A093374 A093375 A093376 this_sequence A093378 A093379 A093380`
	KEYWORD	`nonn`
	AUTHOR	`Goran Kilibarda, Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 28 2004`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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