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 A298657 #4 Jan 24 2018 10:09:44 %S A298657 3,23,23,85,177,431,876,2137,5002,11687,27591,64253,150967,353682, %T A298657 830580,1954490,4575013,10742553,25221766,59150366,138829820, %U A298657 325959550,764905062,1795278490,4214144288,9890202526,23212413440,54483362577 %N A298657 Number of nX5 0..1 arrays with every element equal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero. %C A298657 Column 5 of A298660. %H A298657 R. H. Hardin, <a href="/A298657/b298657.txt">Table of n, a(n) for n = 1..210</a> %e A298657 Some solutions for n=5 %e A298657 ..0..1..0..1..1. .0..0..0..1..0. .0..0..0..1..1. .0..1..1..1..0 %e A298657 ..1..0..1..0..0. .1..0..0..0..1. .1..0..0..0..0. .1..0..0..0..1 %e A298657 ..0..1..0..1..0. .1..0..0..0..0. .1..0..0..1..1. .1..0..0..1..0 %e A298657 ..1..0..1..0..0. .1..0..1..0..0. .0..0..0..1..0. .0..0..0..0..1 %e A298657 ..0..1..0..1..1. .0..1..0..1..0. .1..1..1..0..1. .1..1..1..1..0 %Y A298657 Cf. A298660. %K A298657 nonn %O A298657 1,1 %A A298657 _R. H. Hardin_, Jan 24 2018