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 A076281 #15 Feb 16 2025 08:32:47 %S A076281 0,0,0,0,1,5,52,867,28722,1919895,250530482 %N A076281 Number of 5-chromatic (i.e., chromatic number equals 5) simple graphs on n nodes. %H A076281 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a> %H A076281 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/n-ChromaticGraph.html">n-Chromatic Graph</a> %Y A076281 Column k=5 of A084268. %Y A076281 Cf. A076278, A076279, A076280, A076282. %K A076281 nonn,more %O A076281 1,6 %A A076281 _Eric W. Weisstein_, Oct 06 2002 %E A076281 a(10) from _Keith Briggs_, Mar 14 2006 %E A076281 a(11) from _Michael Sollami_, Jan 28 2012