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 A196297 #7 Jun 02 2025 04:20:30 %S A196297 9,187,1201,14231,160800,1752855,19123802,207927811,2289816421, %T A196297 25196042496,275801202962,3022047651617,33191139932413, %U A196297 364411328809394,3997197786597231,43850392251373127,481263490991618506 %N A196297 Number of nX5 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 A196297 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 A196297 Column 5 of A196300 %H A196297 R. H. Hardin, <a href="/A196297/b196297.txt">Table of n, a(n) for n = 1..200</a> %e A196297 Some solutions for n=4 %e A196297 ..0..1..2..1..0....1..0..0..0..0....0..0..1..1..0....1..1..0..0..1 %e A196297 ..0..2..0..2..0....2..2..1..2..0....0..0..1..1..2....0..2..0..0..2 %e A196297 ..2..1..2..1..1....1..1..1..1..1....1..2..1..0..1....2..1..2..0..1 %e A196297 ..1..0..0..0..1....0..0..0..0..1....1..0..1..1..2....1..0..1..1..2 %K A196297 nonn %O A196297 1,1 %A A196297 _R. H. Hardin_ Sep 30 2011