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 A196682 #7 Jun 02 2025 04:30:16 %S A196682 9,189,1235,15395,188078,2169685,25142624,291420839,3417608122, %T A196682 40048090008,466852430720,5449232674091,63760228123954, %U A196682 745737298355388,8713522565183852,101832009256003145,1190660595164563844 %N A196682 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,2,3 for x=0,1,2,3,4. %C A196682 Every 0 is next to 0 4'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 3's %C A196682 Column 5 of A196685 %H A196682 R. H. Hardin, <a href="/A196682/b196682.txt">Table of n, a(n) for n = 1..200</a> %e A196682 Some solutions for n=4 %e A196682 ..1..0..0..0..1....1..0..0..0..0....1..0..0..1..2....0..0..0..2..1 %e A196682 ..1..1..2..1..1....2..1..1..1..1....1..2..0..1..1....0..2..1..1..0 %e A196682 ..0..2..0..2..0....0..1..1..2..2....0..1..1..2..0....2..1..1..1..0 %e A196682 ..0..1..2..1..0....1..1..0..0..1....0..1..1..0..0....1..0..0..1..1 %K A196682 nonn %O A196682 1,1 %A A196682 _R. H. Hardin_ Oct 05 2011