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 A296538 #4 Dec 15 2017 08:46:05 %S A296538 1,15,96,431,2104,10734,53995,270584,1360373,6842490,34397698, %T A296538 172916932,869345996,4370695957,21973721785,110473467193,555410077197, %U A296538 2792348324294,14038652292860,70579951706145,354843911694537 %N A296538 Number of nX5 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s. %C A296538 Column 5 of A296541. %H A296538 R. H. Hardin, <a href="/A296538/b296538.txt">Table of n, a(n) for n = 1..210</a> %e A296538 Some solutions for n=7 %e A296538 ..0..0..0..0..0. .1..1..1..0..0. .0..0..0..1..0. .0..0..1..0..0 %e A296538 ..1..1..1..0..1. .1..1..0..0..0. .0..1..1..1..0. .1..1..1..0..1 %e A296538 ..1..1..0..1..1. .1..0..0..1..0. .0..1..0..0..0. .1..0..0..1..1 %e A296538 ..1..0..0..0..0. .0..1..1..1..0. .0..0..1..1..1. .0..0..1..1..1 %e A296538 ..0..1..0..0..0. .0..1..0..0..1. .0..1..0..0..1. .0..0..0..0..0 %e A296538 ..1..1..0..0..0. .1..1..0..1..1. .0..1..0..0..1. .0..1..0..0..0 %e A296538 ..0..0..0..0..0. .0..0..1..1..1. .0..1..1..1..0. .1..1..0..0..0 %Y A296538 Cf. A296541. %K A296538 nonn %O A296538 1,2 %A A296538 _R. H. Hardin_, Dec 15 2017