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 A287008 #13 Feb 16 2025 08:33:46 %S A287008 0,1,2,5,13,43,186,1187,13009,270986 %N A287008 Number of disconnected simple graphs on n vertices whose fractional chromatic number equals its chromatic number. %H A287008 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ChromaticNumber.html">Chromatic Number</a> %H A287008 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/FractionalChromaticNumber.html">Fractional Chromatic Number</a> %F A287008 a(n) = A287007(n) - A243252(n). %Y A287008 Cf. A287007 (number of not-necessarily connected simple graphs on n nodes with fractional chromatic number equal to chromatic number). %Y A287008 Cf. A243252 (number of simple connected graphs on n node with fractional chromatic number equal to chromatic number). %K A287008 nonn,more %O A287008 1,3 %A A287008 _Eric W. Weisstein_, May 17 2017