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 A288988 #9 Feb 16 2025 08:33:48 %S A288988 1,3,15,251,65039,4292581227 %N A288988 Number of connected (non-null) induced subgraphs of the n-halved cube graph. %H A288988 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConnectedGraph.html">Connected Graph</a> %H A288988 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HalvedCubeGraph.html">Halved Cube Graph</a> %H A288988 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Vertex-InducedSubgraph.html">Vertex-Induced Subgraph</a> %Y A288988 Cf. A288987, A290758. %K A288988 nonn,more %O A288988 1,2 %A A288988 _Eric W. Weisstein_, Jun 20 2017 %E A288988 a(6) from _Andrew Howroyd_, Aug 15 2017