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 A084273 #8 Feb 16 2025 08:32:49 %S A084273 0,0,1,18,472,18855 %N A084273 Number of labeled connected 3-chromatic (i.e., chromatic number = 3) graphs on n nodes. %H A084273 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/n-ChromaticGraph.html">n-Chromatic Graph</a> %Y A084273 Cf. A001832, A084274. %K A084273 nonn,more %O A084273 1,4 %A A084273 _Eric W. Weisstein_, May 24 2003