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 A132219 #5 Jul 07 2015 22:01:53 %S A132219 1,2,8,66,774,11885,230858,5512821,157926273,5323010347,207833183972, %T A132219 9280406921629,468879370270319,26561064972285450,1673867356632729422, %U A132219 116555375609273658636,8914259769349445083676,744876885721366948399627 %N A132219 Number of line graphs on n labeled nodes. %F A132219 E.g.f.: exp(x/2-x^3/6)*Sum(A020556(n)*(log(1+x)/2)^n/n!, n=0..infinity). %Y A132219 Cf. A132220 (unlabeled case). %K A132219 nonn %O A132219 1,2 %A A132219 _Vladeta Jovovic_, Aug 14 2007