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%I #4 May 10 2013 12:45:31
%S 0,0,1,3,9,65,885,20769,904799,75119535,12059144775,3777502008115,
%T 2321770382163177,2810098818045932049,6714509196242295683053,
%U 31734155232117923771498025,297105206555826680431032956415
%N Number of labeled n-vertex graphs with a 2-component.
%F E.g.f.: (1-exp(-x^2/2))*Sum(2^binomial(n, 2)*x^n/n!, n=0..infinity).
%Y Cf. A093352.
%K nonn
%O 0,4
%A Goran Kilibarda, _Vladeta Jovovic_, Apr 26 2004