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 A283571 #4 Mar 11 2017 08:16:49 %S A283571 26,2832,104464,3890056,129527524,4173039716,129997769458, %T A283571 3965206666608,118919078661476,3520469545329364,103128721861954074, %U A283571 2995091644500263428,86357662212925835570,2474720063522591410712,70543862532039328231208 %N A283571 Number of nX7 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element. %C A283571 Column 7 of A283572. %H A283571 R. H. Hardin, <a href="/A283571/b283571.txt">Table of n, a(n) for n = 1..210</a> %e A283571 Some solutions for n=3 %e A283571 ..0..0..1..0..1..1..1. .0..1..0..0..0..0..1. .0..0..0..0..0..0..0 %e A283571 ..0..0..0..0..0..0..0. .0..0..0..1..1..0..1. .1..0..0..0..0..1..0 %e A283571 ..1..1..0..1..1..0..0. .1..0..1..0..1..0..0. .0..1..1..0..0..0..0 %Y A283571 Cf. A283572. %K A283571 nonn %O A283571 1,1 %A A283571 _R. H. Hardin_, Mar 11 2017