%I #5 Mar 31 2012 12:36:08
%S 609,6512,46764,602024,5254072,56472058,533853394,5585054046,
%T 54998694426,562340568708,5598043072500,56738877828678,
%U 568753193822092,5743694780294918,57708886492197048,581740972471740850
%N Number of (n+1)X4 0..2 arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants
%C Column 3 of A187425
%H R. H. Hardin, <a href="/A187421/b187421.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for 3X4
%e ..2..1..0..1....0..0..0..1....2..2..0..2....0..2..2..2....1..0..2..0
%e ..2..2..2..1....0..0..1..1....1..2..0..0....0..1..1..2....2..1..2..1
%e ..0..1..2..0....2..0..2..1....0..2..0..0....1..1..0..2....1..1..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 09 2011
