This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A093351 #4 May 10 2013 12:45:31 %S A093351 0,0,1,3,9,65,885,20769,904799,75119535,12059144775,3777502008115, %T A093351 2321770382163177,2810098818045932049,6714509196242295683053, %U A093351 31734155232117923771498025,297105206555826680431032956415 %N A093351 Number of labeled n-vertex graphs with a 2-component. %F A093351 E.g.f.: (1-exp(-x^2/2))*Sum(2^binomial(n, 2)*x^n/n!, n=0..infinity). %Y A093351 Cf. A093352. %K A093351 nonn %O A093351 0,4 %A A093351 Goran Kilibarda, _Vladeta Jovovic_, Apr 26 2004