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 A243551 #17 Sep 23 2020 15:58:58 %S A243551 1,1,2,5,14,56,256,1656,13952,163878,2646642,59088801 %N A243551 Number of simple connected graphs with n nodes that have no subgraph isomorphic to the bowtie graph or K_4. %C A243551 K_4 is the complete graph on four vertices. %H A243551 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243551 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, 2014 %H A243551 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 29e68fa. %Y A243551 Cf. A242792 (bowtie free graphs), A079574 (K_4 free graphs). %K A243551 nonn,more %O A243551 1,3 %A A243551 _Travis Hoppe_ and _Anna Petrone_, Jun 06 2014 %E A243551 a(11)-a(12) added using tinygraph by _Falk Hüffner_, Sep 23 2020