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 A076316 #13 Apr 14 2025 00:02:29 %S A076316 1,2,4,11,33,150,985,11390,243791,9965456,753402410,101344230844 %N A076316 Number of 4-colorable (i.e., chromatic number <= 4) simple graphs on n nodes. %H A076316 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/n-ColorableGraph.html">n-Colorable Graph</a> %F A076316 a(n) = A076315(n) + A076280(n). - _Andrew Howroyd_, Dec 02 2018 %Y A076316 Cf. A033995, A076280, A076315, A076317, A076318, A076319, A076320, A076321. %K A076316 nonn,more %O A076316 1,2 %A A076316 _Eric W. Weisstein_, Oct 06 2002 %E A076316 a(10)-a(11) from _Andrew Howroyd_, Dec 02 2018 %E A076316 a(12) from _Sean A. Irvine_, Apr 13 2025