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 A196476 #7 Jun 02 2025 04:25:02 %S A196476 17,43,42,305,2351,38826,299659,1231691,5238322,26129353,141788701, %T A196476 1086218484,7344638998,38637965991,209973350431,1159411392373, %U A196476 6436583617125,39481503993996,240320932969724,1381481638118489 %N A196476 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,3,2,1 for x=0,1,2,3,4. %C A196476 Every 0 is next to 0 4's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 2's, every 4 is next to 4 1's %C A196476 Column 7 of A196477 %H A196476 R. H. Hardin, <a href="/A196476/b196476.txt">Table of n, a(n) for n = 1..103</a> %e A196476 Some solutions for n=4 %e A196476 ..1..1..0..0..0..0..1....1..1..0..1..1..0..0....0..1..1..0..1..1..1 %e A196476 ..0..1..1..1..1..1..1....0..1..1..4..1..0..0....0..1..4..1..1..0..0 %e A196476 ..0..1..4..1..4..1..0....0..1..4..1..1..0..0....1..1..1..4..1..0..0 %e A196476 ..0..1..1..0..1..1..0....0..1..1..0..1..1..1....1..0..0..1..1..0..0 %K A196476 nonn %O A196476 1,1 %A A196476 _R. H. Hardin_ Oct 03 2011