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 A218696 #8 Nov 04 2012 16:16:28
%S A218696 1,15,222,3680,69345,1477182,35234220,932070708,27109785510,
%T A218696 860394764515,29600058300780,1097511032533500,43637308561557074,
%U A218696 1852311640075120980,83612841417061582320,3999611090385007608840,202111299843794061251580,10758947714752854861908379
%N A218696 Number of components over all graphs on n labeled nodes with unicyclic components (graphs counted by A137916).
%H A218696 Alois P. Heinz, <a href="/A218696/b218696.txt">Table of n, a(n) for n = 3..150</a>
%F A218696 a(n) = Sum_{m=1..floor(n/3)} A106239(n,m)*m.
%t A218696 nn=22;t=Sum[n^(n-1)x^n/n!,{n,1,nn}];Drop[Range[0,nn]!CoefficientList[ Series[D[Exp[y(Log[1/(1-t)]/2-t/2-t^2/4)],y]/.y->1,{x,0,nn}],x],3]
%Y A218696 Cf. A057500.
%K A218696 nonn
%O A218696 3,2
%A A218696 _Geoffrey Critzer_, Nov 04 2012