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 A197316 #7 Jun 02 2025 04:50:40 %S A197316 2,27,249,2724,24903,189212,2241018,20425821,208960627,1984221109, %T A197316 20223402011,195734767851,1964217477394,19163046359315, %U A197316 191509608470344,1875354477655910,18682249962661264,183413216662448071 %N A197316 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,1,1,0,0 for x=0,1,2,3,4. %C A197316 Every 0 is next to 0 0's, every 1 is next to 1 1's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 0's %C A197316 Column 7 of A197317 %H A197316 R. H. Hardin, <a href="/A197316/b197316.txt">Table of n, a(n) for n = 1..109</a> %e A197316 Some solutions containing all values 0 to 4 for n=4 %e A197316 ..0..2..1..1..2..0..1....0..3..0..3..0..1..0....1..1..0..2..1..1..2 %e A197316 ..1..1..0..2..1..2..1....1..0..4..0..2..1..2....2..2..1..1..0..2..1 %e A197316 ..2..0..4..0..1..2..2....1..2..0..3..1..0..1....1..0..2..0..4..0..1 %e A197316 ..1..1..0..3..0..1..1....2..1..1..0..1..2..1....1..2..1..1..0..3..0 %K A197316 nonn %O A197316 1,1 %A A197316 _R. H. Hardin_ Oct 13 2011