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 A196706 #7 Jun 02 2025 04:31:50 %S A196706 40,6208,353591,26495227,1883754015,134682461126,9630587515529, %T A196706 688873132970642,49276676966789269,3524626082557601875, %U A196706 252104533342881651241,18032369299020473778391,1289809476341608457763412 %N A196706 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,1,0,4,2 for x=0,1,2,3,4. %C A196706 Every 0 is next to 0 3's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 4's, every 4 is next to 4 2's %C A196706 Column 7 of A196707 %H A196706 R. H. Hardin, <a href="/A196706/b196706.txt">Table of n, a(n) for n = 1..75</a> %e A196706 Some solutions for n=4 %e A196706 ..0..0..0..0..0..1..1....0..0..0..2..0..2..0....0..0..0..0..1..0..1 %e A196706 ..0..0..0..2..1..0..0....0..0..0..2..1..1..0....0..0..0..0..1..0..1 %e A196706 ..0..0..0..2..1..2..2....0..0..0..0..0..0..1....0..0..0..0..2..2..0 %e A196706 ..0..2..2..0..0..0..0....0..0..0..1..1..0..1....0..0..0..0..0..1..1 %K A196706 nonn %O A196706 1,1 %A A196706 _R. H. Hardin_ Oct 05 2011