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 A243244 #19 Aug 15 2021 14:51:54 %S A243244 0,0,0,1,4,30,317,5511,165165,8932499,870814993,153082769374, %T A243244 48887756906623 %N A243244 Number of unlabeled, connected graphs on n vertices with at least one induced subgraph isomorphic to a K_4, where K_4 is the complete graph on four vertices. %H A243244 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243244 T. Hoppe and A. Petrone, <a href="http://arxiv.org/abs/1408.3644">Integer sequence discovery from small graphs</a>, arXiv preprint arXiv:1408.3644 [math.CO], 2014. %F A243244 a(n) = A001349(n) - A079574(n). %K A243244 nonn,more %O A243244 1,5 %A A243244 _Travis Hoppe_ and _Anna Petrone_, Jun 01 2014 %E A243244 a(11) and a(12) from formula by _Falk Hüffner_, Jan 14 2016 %E A243244 a(13) from formula by _Falk Hüffner_, Aug 15 2021