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 A196216 #7 Jun 02 2025 04:19:23 %S A196216 16,544,5110,101780,1937895,33962624,608417005,11132866106, %T A196216 202301552532,3661731514195,66431113288877,1207694877279204, %U A196216 21927197259395828,397962224047643681,7227485386946689259,131272592634933828858 %N A196216 Number of nX6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,1,2,4 for x=0,1,2,3,4. %C A196216 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 2's, every 4 is next to 4 4's %C A196216 Column 6 of A196218 %H A196216 R. H. Hardin, <a href="/A196216/b196216.txt">Table of n, a(n) for n = 1..151</a> %e A196216 Some solutions for n=4 %e A196216 ..1..1..0..1..1..2....0..0..1..1..0..1....1..0..1..1..0..1....0..0..1..2..0..1 %e A196216 ..0..2..1..2..0..1....1..1..1..2..0..1....2..0..2..2..1..1....0..0..1..1..0..2 %e A196216 ..0..2..1..0..0..1....1..1..0..0..0..1....1..0..1..3..2..0....0..0..1..1..2..1 %e A196216 ..0..1..2..0..0..1....0..2..1..2..1..2....1..0..1..2..1..0....1..1..2..0..0..0 %K A196216 nonn %O A196216 1,1 %A A196216 _R. H. Hardin_ Sep 29 2011