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 A196296 #7 Jun 02 2025 04:20:25 %S A196296 5,61,290,2161,14231,97892,686759,4731033,32374680,222897413, %T A196296 1539916243,10636418118,73345982967,505430824497,3485517910342, %U A196296 24049220604349,165913015451421,1144300512605372,7891941802463913,54435005065152899 %N A196296 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,1,4,2 for x=0,1,2,3,4. %C A196296 Every 0 is next to 0 3's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 4's, every 4 is next to 4 2's %C A196296 Column 4 of A196300 %H A196296 R. H. Hardin, <a href="/A196296/b196296.txt">Table of n, a(n) for n = 1..200</a> %e A196296 Some solutions for n=5 %e A196296 ..1..1..0..0....0..0..2..1....2..1..0..1....0..1..1..0....2..1..0..0 %e A196296 ..0..2..1..1....0..2..1..0....1..1..1..2....0..1..2..0....1..1..0..0 %e A196296 ..0..0..1..1....1..1..1..1....0..0..1..2....1..1..0..0....0..1..2..0 %e A196296 ..1..2..1..0....2..0..0..1....0..0..1..1....2..1..0..0....2..1..1..0 %e A196296 ..1..0..2..1....1..0..0..1....1..2..1..0....0..1..2..1....1..0..1..1 %K A196296 nonn %O A196296 1,1 %A A196296 _R. H. Hardin_ Sep 30 2011