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A183478 Number of nX4 0..2 arrays with every element equal to either the sum mod 3 of its vertical neighbors or the sum mod 3 of its horizontal neighbors.

%I A183478 #7 Jul 22 2025 08:59:14
%S A183478 7,135,587,4015,40073,270549,1942323,15984991,119888365,894632985,
%T A183478 6977123487,53362780811,405255680609,3117495042837,23903072796727,
%U A183478 182681815961381,1400954811635395,10740879929227211,82253911392409687
%N A183478 Number of nX4 0..2 arrays with every element equal to either the sum mod 3 of its vertical neighbors or the sum mod 3 of its horizontal neighbors.
%C A183478 Column 4 of A183483
%H A183478 R. H. Hardin, <a href="/A183478/b183478.txt">Table of n, a(n) for n = 1..200</a>
%e A183478 Some solutions for 6X4
%e A183478 ..0..0..0..0....0..0..1..1....0..0..0..0....0..2..1..0....0..0..0..0
%e A183478 ..2..2..0..2....1..0..1..1....1..2..0..0....0..2..1..0....0..0..1..1
%e A183478 ..0..0..0..2....1..0..0..0....1..2..0..0....0..0..0..0....0..0..1..1
%e A183478 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..1..1....0..0..0..0
%e A183478 ..0..0..0..2....2..1..2..2....0..0..0..2....0..0..0..0....1..1..0..1
%e A183478 ..1..1..0..2....2..1..2..2....2..2..0..2....1..1..0..0....1..1..0..1
%K A183478 nonn
%O A183478 1,1
%A A183478 _R. H. Hardin_ Jan 05 2011