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 A241137 #6 Jul 23 2025 11:11:47 %S A241137 6,195,6150,238607,9958520,428855442,18742128588,825015103540, %T A241137 36426835430201,1610881122223657,71287590353047925, %U A241137 3155784624457534434,139723512923338940613,6186762308840035967958,273950648299765566159446 %N A241137 Number of nX6 0..2 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..2 introduced in row major order. %C A241137 Column 6 of A241138 %H A241137 R. H. Hardin, <a href="/A241137/b241137.txt">Table of n, a(n) for n = 1..88</a> %e A241137 Some solutions for n=3 %e A241137 ..0..1..1..2..2..2....0..1..1..1..2..0....0..1..2..1..2..2....0..0..0..0..0..1 %e A241137 ..0..0..0..1..1..1....0..2..2..0..2..0....0..1..2..1..0..0....1..1..1..1..1..1 %e A241137 ..0..1..1..2..2..2....1..1..1..0..1..1....0..1..0..0..1..1....2..2..0..0..0..1 %K A241137 nonn %O A241137 1,1 %A A241137 _R. H. Hardin_, Apr 16 2014