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 A196313 #7 Jun 02 2025 04:21:17 %S A196313 17,123,728,13277,132202,1194982,11575179,157085533,1846682222, %T A196313 18830197948,204138811128,2267817750300,25185129693320, %U A196313 280519702209453,3182410412743494,35203253665728279,385376356755364192 %N A196313 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,4,1,3 for x=0,1,2,3,4. %C A196313 Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 4's, every 3 is next to 3 1's, every 4 is next to 4 3's %C A196313 Column 7 of A196314 %H A196313 R. H. Hardin, <a href="/A196313/b196313.txt">Table of n, a(n) for n = 1..197</a> %e A196313 Some solutions for n=4 %e A196313 ..0..0..1..1..1..1..0....0..1..3..1..3..1..0....1..1..0..0..0..0..0 %e A196313 ..1..1..1..0..0..3..1....0..1..1..0..1..1..1....0..3..1..1..3..1..1 %e A196313 ..1..1..1..3..1..1..3....0..1..3..1..3..0..1....0..1..1..1..1..1..1 %e A196313 ..0..0..0..1..1..0..1....1..1..0..1..1..0..1....1..1..0..0..0..0..0 %K A196313 nonn %O A196313 1,1 %A A196313 _R. H. Hardin_ Oct 01 2011