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 A243249 #17 Feb 16 2025 08:33:22 %S A243249 0,0,0,0,6,52,580,9348,246244,11542460 %N A243249 Number of unlabeled, connected graphs on n vertices with at least one subgraph isomorphic to a bowtie graph. %H A243249 Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a> %H A243249 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 %H A243249 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ButterflyGraph.html">Bowtie or Butterfly Graph</a> %F A243249 a(n) = A001349(n) - A242792(n). %K A243249 nonn,more %O A243249 1,5 %A A243249 _Travis Hoppe_ and _Anna Petrone_, Jun 01 2014