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 A287690 #15 Feb 16 2025 08:33:46 %S A287690 1,9,129,5617,964755,617429805,1436456861467,12128014243816259, %T A287690 370157141019558632729,40729998558184127557326187, %U A287690 16129157077874837008807129310501,22956060013827748812137293758719842059,117308080543566432787532732819884994609487361 %N A287690 Number of connected dominating sets in the n X n grid graph. %H A287690 Andrew Howroyd, <a href="/A287690/b287690.txt">Table of n, a(n) for n = 1..15</a> %H A287690 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConnectedDominatingSet.html">Connected Dominating Set</a> %H A287690 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GridGraph.html">Grid Graph</a> %Y A287690 Main diagonal of A291872. %Y A287690 Cf. A059525, A133515, A289180. %K A287690 nonn %O A287690 1,2 %A A287690 _Eric W. Weisstein_, May 29 2017 %E A287690 a(6)-a(13) from _Andrew Howroyd_, Sep 04 2017