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 A295034 #11 Aug 25 2025 10:21:34 %S A295034 1,10,140,6686,898493,355281224,411280569141,1377458578461777, %T A295034 13439667379225204666,381706479329790703639253, %U A295034 31542814403404743062254741113,7585239934805237805543429969496485 %N A295034 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 2 1's. %e A295034 Some solutions for n=4: %e A295034 ..0..1..1..0. .1..1..1..1. .1..0..0..0. .0..0..0..1. .1..0..1..1 %e A295034 ..0..0..1..1. .1..0..0..1. .1..0..0..0. .0..0..1..1. .1..0..1..0 %e A295034 ..1..0..0..1. .0..0..0..0. .1..0..0..0. .1..0..1..0. .0..0..0..1 %e A295034 ..1..1..0..1. .0..1..1..1. .0..0..0..0. .1..1..0..0. .0..1..1..1 %Y A295034 Diagonal of A295040. %K A295034 nonn,more %O A295034 1,2 %A A295034 _R. H. Hardin_, Nov 12 2017