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 A289649 #6 Apr 05 2020 23:34:39 %S A289649 1,642,31271,1756800,98170524,5675111511,332113863074,19700973655406, %T A289649 1179502836506537,71173612294297941,4321709778773574262, %U A289649 263787324115374465023,16170909984602074224282,994955226590688056771461 %N A289649 Number of n X 6 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1. %C A289649 Column 6 of A289651. %H A289649 R. H. Hardin, <a href="/A289649/b289649.txt">Table of n, a(n) for n = 1..53</a> %e A289649 Some solutions for n=3 %e A289649 ..1..0..0..1..1..0. .1..0..0..0..0..1. .1..1..0..1..1..0. .1..0..0..1..0..0 %e A289649 ..0..1..1..0..1..0. .1..0..1..1..0..1. .1..0..0..0..0..1. .0..0..1..0..0..1 %e A289649 ..0..1..0..0..1..0. .1..0..0..0..0..1. .0..1..0..0..1..1. .0..1..1..1..1..0 %Y A289649 Cf. A289651. %K A289649 nonn %O A289649 1,2 %A A289649 _R. H. Hardin_, Jul 09 2017