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 A196299 #7 Jun 02 2025 04:20:41 %S A196299 25,1597,21344,686759,19123802,513362648,14372583192,402254701097, %T A196299 11172616795189,309961960884860,8636593218691567,240597854301944078, %U A196299 6696378931249054755,186420836116243663032,5190804183327066922164 %N A196299 Number of nX7 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 A196299 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 A196299 Column 7 of A196300 %H A196299 R. H. Hardin, <a href="/A196299/b196299.txt">Table of n, a(n) for n = 1..64</a> %e A196299 Some solutions for n=4 %e A196299 ..0..0..0..1..1..1..0....0..0..0..1..2..1..2....0..0..0..0..0..0..1 %e A196299 ..1..1..2..1..0..1..1....1..1..1..1..0..0..1....0..0..2..1..1..1..2 %e A196299 ..2..1..0..1..2..1..1....2..1..1..1..0..0..1....0..0..1..2..2..1..0 %e A196299 ..0..2..1..1..0..0..0....0..0..0..1..2..1..2....1..1..1..0..0..2..1 %K A196299 nonn %O A196299 1,1 %A A196299 _R. H. Hardin_ Sep 30 2011