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 A290719 #13 Feb 16 2025 08:33:50 %S A290719 1,3,22,168,5251,194751,27478594,3852814320,2065546517563 %N A290719 Number of (non-null) connected induced subgraphs in the n X n black bishop graph. %H A290719 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BlackBishopGraph.html">Black Bishop Graph</a> %H A290719 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConnectedGraph.html">Connected Graph</a> %H A290719 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Vertex-InducedSubgraph.html">Vertex-Induced Subgraph</a> %Y A290719 Cf. A289145, A290769. %K A290719 nonn,more %O A290719 1,2 %A A290719 _Eric W. Weisstein_, Aug 09 2017 %E A290719 a(8)-a(9) from _Andrew Howroyd_, Aug 15 2017