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 A196144 #7 Jun 02 2025 04:18:18 %S A196144 12,62,85,346,1031,2599,7486,22292,61689,177057,510032,1448637, %T A196144 4132242,11862868,33916712,96889032,277372934,794009775,2271276412, %U A196144 6499360165,18601549495,53231495224,152336019308,435981877255,1247751132201 %N A196144 Number of nX6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,4,1,2 for x=0,1,2,3,4. %C A196144 Every 0 is next to 0 3's, every 1 is next to 1 0's, every 2 is next to 2 4's, every 3 is next to 3 1's, every 4 is next to 4 2's %C A196144 Column 6 of A196146 %H A196144 R. H. Hardin, <a href="/A196144/b196144.txt">Table of n, a(n) for n = 1..200</a> %e A196144 Some solutions for n=4 %e A196144 .1.1.3.1.0.0...1.1.0.0.0.0...0.0.1.1.0.0...0.0.0.0.0.1 %e A196144 .0.0.1.1.0.0...0.1.1.1.1.1...1.1.3.3.1.1...1.1.1.1.1.1 %e A196144 .0.0.1.1.0.0...1.1.1.1.1.1...3.1.1.1.1.1...3.1.1.1.1.0 %e A196144 .0.0.1.3.1.1...1.0.0.0.0.0...1.0.0.0.0.0...1.0.0.0.1.1 %K A196144 nonn %O A196144 1,1 %A A196144 _R. H. Hardin_ Sep 28 2011