%I #5 Mar 31 2012 12:36:06
%S 2176,253312,7946432,394724320,15491352288,686342587904,
%T 28533024476512,1225810619871552,51768892508647296,
%U 2205828537779532832,93555571372805665280,3977486749634600724032,168891302791156877237312
%N Number of (n+1)X4 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces
%C Column 3 of A186923
%H R. H. Hardin, <a href="/A186917/b186917.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for 3X4
%e ..0..0..2..1....2..1..2..1....2..3..0..2....0..0..2..3....2..3..0..3
%e ..3..2..2..0....0..0..2..0....3..2..1..3....0..2..2..3....2..2..1..2
%e ..3..2..3..0....3..2..3..0....0..1..2..2....0..2..0..3....0..3..3..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 28 2011
