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A093352 Number of labeled n-vertex graphs without a 2-component. 3
1, 1, 1, 5, 55, 959, 31883, 2076383, 267530657, 68644357201, 35172312944057, 36025019516955853, 73784654524456043287, 302228644804839247744495, 2475873364061564307502565395, 40564787473148108729970731074007 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

FORMULA

E.g.f.: exp(-x^2/2)*Sum(2^binomial(n, 2)*x^n/n!, n=0..infinity).

CROSSREFS

Cf. A093351.

Sequence in context: A008543 A057130 A141357 * A195513 A172493 A155807

Adjacent sequences:  A093349 A093350 A093351 * A093353 A093354 A093355

KEYWORD

nonn

AUTHOR

Goran Kilibarda, Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 26 2004

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.