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 A295530 #4 Nov 23 2017 09:26:55 %S A295530 37,2735,113466,5400933,253594307,11938414614,563330031268, %T A295530 26515589323171,1248681784524804,58814998591494213, %U A295530 2770085782332161201,130464623191695045459,6144598685123051237293,289398247960170761817752 %N A295530 Number of nX7 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1s. %C A295530 Column 7 of A295531. %H A295530 R. H. Hardin, <a href="/A295530/b295530.txt">Table of n, a(n) for n = 1..210</a> %e A295530 Some solutions for n=5 %e A295530 ..0..0..0..0..0..1..1. .0..0..0..1..0..1..1. .0..0..0..1..0..1..1 %e A295530 ..0..0..0..0..0..0..0. .0..0..0..1..0..0..0. .0..0..0..1..1..1..1 %e A295530 ..0..0..0..0..0..0..1. .0..0..0..0..0..1..0. .0..0..0..0..0..1..0 %e A295530 ..0..0..0..1..0..0..1. .0..0..0..0..0..1..1. .0..0..0..1..1..0..0 %e A295530 ..0..0..1..1..0..1..1. .0..0..0..0..0..0..1. .0..0..1..1..0..0..0 %Y A295530 Cf. A295531. %K A295530 nonn %O A295530 1,1 %A A295530 _R. H. Hardin_, Nov 23 2017