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 A196948 #7 Jun 02 2025 04:38:22 %S A196948 22,1792,60206,2711711,115982718,4998342821,215125975535, %T A196948 9264434681345,398999272140802,17183027304906341,739976127644014381, %U A196948 31866637523239838485,1372323690154136755767,59098628715389492859730 %N A196948 Number of nX6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,1,0,2,3 for x=0,1,2,3,4. %C A196948 Every 0 is next to 0 4's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 3's %C A196948 Column 6 of A196950 %H A196948 R. H. Hardin, <a href="/A196948/b196948.txt">Table of n, a(n) for n = 1..153</a> %e A196948 Some solutions for n=4 %e A196948 ..0..0..0..0..1..1....0..0..2..0..0..0....0..0..0..1..0..2....0..0..0..0..1..0 %e A196948 ..0..0..1..2..0..0....0..0..1..1..2..2....0..0..0..1..0..0....0..0..0..0..1..2 %e A196948 ..0..0..1..2..0..2....0..0..2..2..0..0....2..1..0..0..1..1....0..0..0..0..2..0 %e A196948 ..1..1..0..0..1..1....0..0..0..0..0..2....0..1..2..0..0..0....0..0..0..0..1..1 %K A196948 nonn %O A196948 1,1 %A A196948 _R. H. Hardin_ Oct 08 2011