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 A243242 #9 Dec 01 2015 11:50:23 %S A243242 0,0,0,0,1,5,51,865,28230,1810796 %N A243242 Number of unlabeled, connected graphs on n vertices with at least one induced subgraph isomorphic to a K_5, where K_5 is the complete graph on five vertices. %H A243242 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %F A243242 a(n) = A001349(n) - A241782(n). %K A243242 nonn,more %O A243242 1,6 %A A243242 _Travis Hoppe_ and _Anna Petrone_, Jun 01 2014