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 A284333 #6 Apr 05 2020 22:54:07 %S A284333 33,1481,120058,13941789,1495300322,177476886878,20513380740103, %T A284333 2467754689139967,294625135884008616,35796621202795670294, %U A284333 4346160057088704088179,532218134572276626959066 %N A284333 Number of n X 7 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. %C A284333 Column 7 of A284334. %H A284333 R. H. Hardin, <a href="/A284333/b284333.txt">Table of n, a(n) for n = 1..25</a> %e A284333 Some solutions for n=3 %e A284333 ..0..0..1..1..0..1..0. .0..1..1..0..1..0..0. .0..0..0..0..1..0..1 %e A284333 ..0..0..0..0..1..1..0. .1..0..0..1..1..1..1. .1..1..0..1..0..1..1 %e A284333 ..0..0..1..1..1..1..0. .0..0..1..0..0..1..0. .0..1..1..0..0..1..1 %Y A284333 Cf. A284334. %K A284333 nonn %O A284333 1,1 %A A284333 _R. H. Hardin_, Mar 25 2017