id:A093351 - OEIS Search Results

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Number of labeled n-vertex graphs with a 2-component.

+0
4

0, 0, 1, 3, 9, 65, 885, 20769, 904799, 75119535, 12059144775, 3777502008115, 2321770382163177, 2810098818045932049, 6714509196242295683053, 31734155232117923771498025, 297105206555826680431032956415 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`E.g.f.: (1-exp(-x^2/2))Sum(2^binomial(n, 2)x^n/n!, n=0..infinity).`
	CROSSREFS	`Cf. A093352.` `Sequence in context: A144525 A087673 A046239 this_sequence A018543 A026090 A119751` `Adjacent sequences: A093348 A093349 A093350 this_sequence A093352 A093353 A093354`
	KEYWORD	`nonn`
	AUTHOR	`Goran Kilibarda, Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 26 2004`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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