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 A297857 #4 Jan 07 2018 10:41:16 %S A297857 8,95,53,145,130,146,181,289,294,594,711,1167,1681,2374,3827,6129, %T A297857 8841,14042,20888,31498,51865,82514,125083,194859,300754,471476, %U A297857 758967,1198480,1863140,2913216,4550700,7227150,11533654,18154246,28482607 %N A297857 Number of nX7 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero. %C A297857 Column 7 of A297858. %H A297857 R. H. Hardin, <a href="/A297857/b297857.txt">Table of n, a(n) for n = 1..210</a> %e A297857 Some solutions for n=7 %e A297857 ..0..1..0..1..0..1..0. .0..1..0..1..0..1..0. .0..1..0..0..0..1..0 %e A297857 ..0..1..0..1..1..0..1. .0..1..0..1..0..1..0. .0..1..1..1..1..1..0 %e A297857 ..1..1..1..0..1..0..0. .0..1..0..1..0..1..0. .1..1..0..0..0..1..1 %e A297857 ..0..0..1..0..1..1..1. .0..1..0..1..0..1..0. .0..0..1..1..1..0..0 %e A297857 ..1..0..1..1..0..1..0. .0..1..0..1..0..1..0. .1..0..0..0..0..0..1 %e A297857 ..0..1..0..1..0..1..0. .1..0..0..0..1..1..1. .1..0..1..1..1..0..1 %e A297857 ..0..1..1..1..0..1..0. .0..1..1..0..1..0..0. .0..1..0..0..0..1..0 %Y A297857 Cf. A297858. %K A297857 nonn %O A297857 1,1 %A A297857 _R. H. Hardin_, Jan 07 2018