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 A197196 #7 Jun 02 2025 04:46:03 %S A197196 6,41,213,1283,7363,42664,247053,1431868,8291425,48020216,278171097, %T A197196 1611110131,9331719493,54050435220,313063366107,1813289742008, %U A197196 10502730648812,60832658109790,352347783107193,2040827608413023 %N A197196 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,1,3,2,0 for x=0,1,2,3,4. %C A197196 Every 0 is next to 0 4's, every 1 is next to 1 1's, every 2 is next to 2 3's, every 3 is next to 3 2's, every 4 is next to 4 0's %C A197196 Column 5 of A197199 %H A197196 R. H. Hardin, <a href="/A197196/b197196.txt">Table of n, a(n) for n = 1..210</a> %e A197196 Some solutions for n=4 %e A197196 ..0..0..0..1..0....1..0..1..1..0....0..0..1..0..1....0..0..0..0..0 %e A197196 ..0..0..0..1..0....1..0..0..0..1....1..0..1..0..1....1..0..0..1..1 %e A197196 ..0..0..0..0..0....0..0..0..0..1....1..0..0..0..0....1..0..1..0..0 %e A197196 ..0..1..1..0..0....0..0..1..1..0....0..1..1..0..0....0..0..1..0..0 %K A197196 nonn %O A197196 1,1 %A A197196 _R. H. Hardin_ Oct 11 2011