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 A076323 #26 Apr 14 2025 00:02:34
%S A076323 1,1,2,6,20,107,801,10227,231228,9708788,743177051,100580560531
%N A076323 Number of connected 4-colorable (i.e., chromatic number <= 4) simple graphs on n nodes.
%H A076323 Maria Chudnovsky, Jan Goedgebeur, Oliver Schaudt, Mingxian Zhong, <a href="http://arxiv.org/abs/1504.06979">Obstructions for three-coloring graphs without induced paths on six vertices</a>, arXiv preprint, arXiv:1504.06979 [math.CO], 2015-2018.
%H A076323 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/n-ColorableGraph.html">n-Colorable Graph</a>
%F A076323 Inverse Euler transform of A076316. - _Andrew Howroyd_, Dec 02 2018
%t A076323 A076316 = Cases[Import["https://oeis.org/A076316/b076316.txt", "Table"], {_, _}][[All, 2]];
%t A076323 (* EulerInvTransform is defined in A022562 *)
%t A076323 EulerInvTransform[A076316] (* Jean-François Alcover, Sep 25 2019, updated Mar 17 2020 *)
%Y A076323 Cf. A005142, A076322, A076324, A076325, A076326, A076327, A076328.
%Y A076323 Cf. A076280, A076316, A084269, A126738.
%K A076323 nonn,more
%O A076323 1,3
%A A076323 _Eric W. Weisstein_, Oct 06 2002
%E A076323 a(10)-a(11) from _Andrew Howroyd_, Dec 02 2018
%E A076323 a(12) from _Sean A. Irvine_, Apr 13 2025