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 A284195 #6 Apr 05 2020 22:38:38 %S A284195 6,40,412,5268,71181,1001047,14392557,210449237,3113715736, %T A284195 46513546197,700181791562,10607318574496,161549350874286, %U A284195 2471455506147877,37954136853757557,584775548813145717,9035444086858648868 %N A284195 Number of n X 4 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero. %C A284195 Column 4 of A284199. %H A284195 R. H. Hardin, <a href="/A284195/b284195.txt">Table of n, a(n) for n = 1..207</a> %e A284195 Some solutions for n=4 %e A284195 ..0..1..0..1. .0..0..1..1. .0..0..0..0. .0..0..0..0. .0..0..0..0 %e A284195 ..0..0..0..1. .1..1..0..0. .0..0..0..1. .1..0..1..1. .1..1..0..0 %e A284195 ..0..0..1..0. .0..1..1..0. .0..1..1..0. .0..1..1..0. .1..1..0..0 %e A284195 ..1..1..1..1. .0..0..1..1. .1..1..0..1. .0..1..1..1. .1..1..1..1 %Y A284195 Cf. A284199. %K A284195 nonn %O A284195 1,1 %A A284195 _R. H. Hardin_, Mar 22 2017