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 A308581 #9 Aug 08 2024 21:08:30 %S A308581 7,149,325743,5043335556445821, %T A308581 30078276004358776950017905751009745821222898855 %N A308581 Number of connected induced subgraphs in the n-Hanoi graph. %H A308581 Andrew Howroyd, <a href="/A308581/b308581.txt">Table of n, a(n) for n = 1..7</a> %H A308581 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConnectedGraph.html">Connected Graph</a>. %H A308581 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HanoiGraph.html">Hanoi Graph</a>. %H A308581 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Vertex-InducedSubgraph.html">Vertex-Induced Subgraph</a>. %Y A308581 Cf. A373441. %K A308581 nonn %O A308581 1,1 %A A308581 _Eric W. Weisstein_, Jun 08 2019 %E A308581 a(4) onwards from _Andrew Howroyd_, Aug 08 2024