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 A222586 #6 Aug 26 2022 15:18:15 %S A222586 14,200,4790,128213,3778560,120603073,4091063379,143156705294, %T A222586 5118550268413,185282388086575,6763852355780438,248203088995170330, %U A222586 9144018841491035138,337809884604604139979,12507948080012427636427 %N A222586 Number of n X 6 0..2 arrays with no more than floor(nX6/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order. %C A222586 Column 6 of A222587. %H A222586 R. H. Hardin, <a href="/A222586/b222586.txt">Table of n, a(n) for n = 1..16</a> %e A222586 Some solutions for n=3 %e A222586 ..0..0..1..1..1..1....0..0..0..1..2..1....0..0..0..0..1..1....0..0..0..1..2..2 %e A222586 ..0..0..0..1..1..1....0..0..0..0..2..2....0..0..0..0..1..1....0..0..0..0..0..0 %e A222586 ..0..0..0..2..0..1....0..0..0..0..2..2....2..0..0..0..0..1....0..0..0..0..0..2 %Y A222586 Cf. A222587. %K A222586 nonn %O A222586 1,1 %A A222586 _R. H. Hardin_, Feb 25 2013