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A197668 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.

%I A197668 #7 Jun 02 2025 05:04:27
%S A197668 5,71,546,5005,44323,403960,3675345,33272751,301565202,2734015025,
%T A197668 24796812073,224875172500,2039110071283,18490725428895,
%U A197668 167679905896100,1520586052304877,13789181642921163,125044668702632018
%N A197668 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.
%C A197668 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 0's, every 4 is next to 4 1's
%C A197668 Column 4 of A197672
%H A197668 R. H. Hardin, <a href="/A197668/b197668.txt">Table of n, a(n) for n = 1..210</a>
%e A197668 Some solutions containing all values 0 to 4 for n=5
%e A197668 ..0..0..0..1....0..2..1..0....1..0..1..2....0..2..1..0....0..1..1..0
%e A197668 ..0..3..0..1....0..1..4..1....2..1..4..1....0..1..4..1....1..4..1..2
%e A197668 ..1..1..0..1....0..2..1..2....0..2..1..0....2..1..1..1....2..1..0..1
%e A197668 ..1..4..1..2....3..0..0..0....3..0..2..0....1..0..0..0....0..3..0..1
%e A197668 ..0..1..1..0....0..3..0..0....0..0..1..1....1..0..3..0....0..0..0..1
%K A197668 nonn
%O A197668 1,1
%A A197668 _R. H. Hardin_ Oct 17 2011