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 A297543 #4 Dec 31 2017 15:03:11 %S A297543 1,381,4617,65363,2748026,67372651,1610981344,45496070039, %T A297543 1204223924807,31395434922611,839621841413395,22297914534222936, %U A297543 589873752024831225,15663501392099069812,415682851416335706284,11022783242886075047889 %N A297543 Number of nX7 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1s. %C A297543 Column 7 of A297544. %H A297543 R. H. Hardin, <a href="/A297543/b297543.txt">Table of n, a(n) for n = 1..210</a> %e A297543 Some solutions for n=5 %e A297543 ..0..0..0..1..1..0..0. .0..0..0..1..1..1..0. .0..0..0..0..1..0..0 %e A297543 ..0..0..0..0..1..1..0. .0..0..1..0..0..1..1. .0..0..0..1..0..1..0 %e A297543 ..0..0..0..0..1..1..0. .0..0..1..1..0..0..0. .0..0..1..0..0..1..1 %e A297543 ..0..1..0..0..0..1..0. .1..1..0..0..0..0..0. .1..1..1..0..1..1..1 %e A297543 ..1..1..1..0..1..1..1. .0..1..1..0..0..0..0. .0..1..0..0..0..0..0 %Y A297543 Cf. A297544. %K A297543 nonn %O A297543 1,2 %A A297543 _R. H. Hardin_, Dec 31 2017