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 A289874 #5 Feb 16 2025 08:33:49 %S A289874 1,7,60,972,31849,2073467,267414258 %N A289874 Number of (non-null) connected induced subgraphs in the n-triangular honeycomb queen graph. %H A289874 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConnectedGraph.html">Connected Graph</a> %H A289874 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Vertex-InducedSubgraph.html">Vertex-Induced Subgraph</a> %K A289874 nonn,more %O A289874 1,2 %A A289874 _Eric W. Weisstein_, Jul 14 2017