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 A294724 #9 Nov 08 2017 02:26:09 %S A294724 0,0,0,1,11,96,785,6283,49987,397768,3174084,25426290,204538114, %T A294724 1652327820,13402442651,109129475455,891793354235,7312118010384, %U A294724 60141701374424,496095022537998,4103183675407098,34022136992384720 %N A294724 Number of Q graphs with 2*n vertices rooted at an internal edge. %H A294724 R. C. Read, <a href="http://dx.doi.org/10.1007/BF02188172">On the enumeration of a class of plane multigraphs</a>, Aequat. Math. 31 (1986) no 1, 47-63. %F A294724 G.f.: P(x) * (B(x) - x)^2 where P(x) is the g.f. for A003169 and B(x) is the g.f. for A003168. %Y A294724 Cf. A003168, A003169. %K A294724 nonn %O A294724 1,5 %A A294724 _Sean A. Irvine_, Nov 07 2017