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%I #6 Mar 31 2012 12:36:12
%S 704,15776,315520,6781400,146491208,3204417424,70324529528,
%T 1550290704312,34247741174176,758246919492968,16810324686733992,
%U 373161215486655440,8291015786317391720,184361263940488110328,4102028210533831306896
%N Number of (n+1)X3 0..3 arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums
%C Column 2 of A188370
%H R. H. Hardin, <a href="/A188368/b188368.txt">Table of n, a(n) for n = 1..54</a>
%e Some solutions for 4X3
%e ..2..0..1....2..0..1....0..0..0....0..0..0....0..3..0....2..2..2....2..1..2
%e ..2..1..3....0..0..2....1..1..1....0..1..0....0..2..0....3..2..3....2..3..0
%e ..0..3..0....1..1..0....2..0..0....2..2..2....2..3..0....1..2..1....3..0..3
%e ..1..2..2....0..0..2....1..1..3....2..2..2....0..2..2....1..0..1....3..0..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 29 2011
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