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 A299609 #4 Feb 14 2018 07:12:59 %S A299609 3,23,23,85,179,453,1006,2523,6002,14802,36299,87591,214486,522937, %T A299609 1275628,3120041,7614933,18586581,45384416,110821038,270585507, %U A299609 660827950,1613737854,3940683638,9622959317,23498981429,57383159995,140126697433 %N A299609 Number of nX5 0..1 arrays with every element equal to 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero. %C A299609 Column 5 of A299612. %H A299609 R. H. Hardin, <a href="/A299609/b299609.txt">Table of n, a(n) for n = 1..210</a> %e A299609 Some solutions for n=6 %e A299609 ..0..1..0..0..0. .0..1..0..0..0. .0..1..1..0..1. .0..1..1..0..1 %e A299609 ..0..0..1..1..1. .1..0..1..1..1. .1..0..0..0..1. .0..0..0..0..1 %e A299609 ..0..0..0..0..0. .1..0..0..0..0. .1..0..0..0..1. .0..0..0..0..1 %e A299609 ..1..0..0..0..1. .1..0..0..0..1. .0..0..0..0..0. .1..0..0..0..0 %e A299609 ..1..0..0..0..1. .0..0..0..0..1. .0..0..1..1..1. .1..0..0..0..0 %e A299609 ..1..0..1..1..0. .1..1..1..0..1. .0..1..0..0..0. .1..0..1..1..0 %Y A299609 Cf. A299612. %K A299609 nonn %O A299609 1,1 %A A299609 _R. H. Hardin_, Feb 14 2018