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 A076321 #15 Feb 16 2025 08:32:47 %S A076321 1,2,4,11,34,156,1044,12346,274668,12005167,1018997853 %N A076321 Number of 9-colorable (i.e., chromatic number <= 9) simple graphs on n nodes. %H A076321 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/n-ColorableGraph.html">n-Colorable Graph</a> %F A076321 a(n) = A076320(n) + A205568(n). - _Andrew Howroyd_, Dec 02 2018 %Y A076321 Cf. A033995, A076315, A076316, A076317, A076318, A076319, A076320, A205568. %Y A076321 Cf. A000088. [_R. J. Mathar_, Sep 21 2008] %K A076321 nonn,more %O A076321 1,2 %A A076321 _Eric W. Weisstein_, Oct 06 2002 %E A076321 a(10)-a(11) from _Andrew Howroyd_, Dec 02 2018