%I #5 Mar 31 2012 12:36:07
%S 12609,1853892,99203418,7020258336,440941355208,29716252404984,
%T 1928394629936928,127632346709629266,8355847987373669514,
%U 550355304750006790962,36131509292425042328892,2376245166849996273772092
%N Number of (n+1)X6 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces
%C Column 5 of A187140
%H R. H. Hardin, <a href="/A187136/b187136.txt">Table of n, a(n) for n = 1..28</a>
%e Some solutions for 4X6
%e ..1..0..0..1..2..1....0..0..0..1..2..0....1..1..0..2..1..2....0..0..1..1..0..2
%e ..0..0..1..1..2..1....0..0..1..2..1..0....0..0..0..0..1..2....0..0..1..2..1..2
%e ..0..0..0..0..2..2....0..0..1..1..1..2....0..0..1..0..0..2....0..0..1..2..1..2
%e ..0..0..0..1..1..2....0..0..0..0..0..2....0..0..0..0..1..1....0..0..0..1..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 05 2011
