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 A287427 #15 Feb 16 2025 08:33:46 %S A287427 0,1,2,5,12,36,121,505,2613,17219,144696,1542668,20695228,347085846 %N A287427 Number of disconnected chordal simple graphs on n vertices. %H A287427 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ChordalGraph.html">Chordal Graph</a> %H A287427 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/DisconnectedGraph.html">Disconnected Graph</a> %F A287427 a(n) = A048193(n) - A048192(n). %Y A287427 Cf. A048193 (not-necessarily connected chordal graphs). %Y A287427 Cf. A048192 (connected chordal graphs). %K A287427 nonn,more %O A287427 1,3 %A A287427 _Eric W. Weisstein_, May 24 2017