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 A295274 #4 Nov 19 2017 08:18:01 %S A295274 81,2570,99245,3697742,139221499,5221177246,196091375073, %T A295274 7361533108317,276386201580189,10376697508977992,389585088134351369, %U A295274 14626667590533685932,549146940474831592906,20617295057949494189434 %N A295274 Number of nX7 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1 or 4 1s. %C A295274 Column 7 of A295275. %H A295274 R. H. Hardin, <a href="/A295274/b295274.txt">Table of n, a(n) for n = 1..210</a> %e A295274 Some solutions for n=3 %e A295274 ..0..1..0..0..0..0..1....0..0..1..0..0..0..0....0..0..1..0..1..0..1 %e A295274 ..0..0..1..0..0..0..0....0..0..1..0..1..0..1....0..1..0..1..1..1..0 %e A295274 ..0..0..0..0..1..1..0....1..1..0..0..0..0..1....0..0..1..0..1..0..0 %Y A295274 Cf. A295275. %K A295274 nonn %O A295274 1,1 %A A295274 _R. H. Hardin_, Nov 19 2017