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 A133793 #12 Feb 16 2025 08:33:06 %S A133793 0,9,161,11236,3270375,3416753209,13057656650476,183641258024619409, %T A133793 9467975365082755623313,1790666611784474236947695716, %U A133793 1242439796942800308861023912760955,3162387266575455438028580027523664208409,29528027257213781096968410946112929405583355140 %N A133793 Number of n X n binary matrices with every element adjacent to some 0 horizontally or vertically. %C A133793 a(n) is the number of total dominating sets of the n X n grid graph. - _Eric W. Weisstein_, Apr 19 2018 %H A133793 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GridGraph.html">Grid Graph</a> %H A133793 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TotalDominatingSet.html">Total Dominating Set</a> %Y A133793 Main diagonal of A303111. %K A133793 nonn %O A133793 1,2 %A A133793 _R. H. Hardin_, Jan 05 2008 %E A133793 a(1) = 0 prepended by _Eric W. Weisstein_, Apr 19 2018 %E A133793 a(12)-a(13) from _Andrew Howroyd_, Apr 19 2018