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%I #9 Mar 29 2018 08:48:51
%S 4,28,88,400,1936,8368,38272,176320,800512,3661312,16761088,76588288,
%T 350288896,1602288640,7327467520,33513336832,153280811008,
%U 701043896320,3206335627264,14664712241152,67071268225024,306761100427264
%N Number of n X 2 0..3 arrays with every element equal to either the sum mod 4 of its vertical neighbors or the sum mod 4 of its horizontal neighbors.
%C Column 2 of A183492.
%H R. H. Hardin, <a href="/A183485/b183485.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n) = 4*a(n-1) + 24*a(n-3) - 48*a(n-4) - 144*a(n-6).
%F Empirical g.f.: 4*x*(1 + 3*x - 6*x^2 - 12*x^3 - 36*x^4 - 36*x^5) / ((1 - 12*x^3)*(1 - 4*x - 12*x^3)). - _Colin Barker_, Mar 29 2018
%e Some solutions for 3 X 2.
%e ..3..3....1..0....0..2....0..0....3..2....3..3....0..0....3..3....0..0....1..1
%e ..2..2....1..0....0..2....3..2....3..2....0..0....3..0....1..1....3..3....0..0
%e ..2..2....0..0....0..0....3..2....0..0....3..3....3..0....2..2....3..3....3..3
%Y Cf. A183492.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 05 2011
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