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 A295212 #4 Nov 17 2017 07:25:33 %S A295212 1,69,1162,27208,775547,18444470,444447937,10896495280,265837272259, %T A295212 6495847859424,158822121967384,3880909066698091,94831337129003187, %U A295212 2317336322758510242,56626572178295328836,1383738694001835856870 %N A295212 Number of nX7 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1s. %C A295212 Column 7 of A295213. %H A295212 R. H. Hardin, <a href="/A295212/b295212.txt">Table of n, a(n) for n = 1..210</a> %e A295212 Some solutions for n=4 %e A295212 ..0..1..1..1..1..0..0. .1..1..1..0..0..0..0. .1..1..0..0..1..1..1 %e A295212 ..1..1..1..0..1..0..0. .1..0..1..1..1..1..0. .1..1..0..1..1..0..1 %e A295212 ..1..0..1..0..1..1..1. .1..1..1..0..0..1..1. .0..1..1..1..1..0..1 %e A295212 ..1..1..1..0..0..1..1. .0..1..1..0..0..1..1. .0..1..1..0..1..1..1 %Y A295212 Cf. A295213. %K A295212 nonn %O A295212 1,2 %A A295212 _R. H. Hardin_, Nov 17 2017