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 A284769 #6 Apr 05 2020 23:04:09 %S A284769 12,772,38792,2134812,121021322,7032604532,415218866820, %T A284769 24791001439744,1492759389444440,90482039904046564, %U A284769 5513803407272591036,337477786522832860972,20731570783539196500470,1277528701244695326636560 %N A284769 Number of n X 6 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 one less than the number of 0's adjacent to some 1. %C A284769 Column 6 of A284771. %H A284769 R. H. Hardin, <a href="/A284769/b284769.txt">Table of n, a(n) for n = 1..40</a> %e A284769 Some solutions for n=3 %e A284769 ..1..0..0..0..1..1. .0..0..0..0..0..1. .1..1..0..1..1..0. .1..1..1..0..0..0 %e A284769 ..1..0..1..1..0..0. .1..0..1..0..1..0. .1..1..0..0..1..0. .1..0..1..1..0..1 %e A284769 ..0..0..0..0..1..1. .1..0..0..1..1..1. .0..1..0..0..0..0. .0..0..1..0..0..0 %Y A284769 Cf. A284771. %K A284769 nonn %O A284769 1,1 %A A284769 _R. H. Hardin_, Apr 02 2017