%I #5 Mar 31 2012 12:36:02
%S 171,2121,24993,313105,3959747,50512903,646053371,8287005157,
%T 106415024441,1368098434721,17598078326551,226486740265787,
%U 2915699882756875,37545244543350913,483541481413780309
%N Number of (n+1)X3 0..2 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum
%C Column 2 of A185614
%H R. H. Hardin, <a href="/A185611/b185611.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for 5X3
%e ..0..2..0....0..2..0....0..0..0....0..2..1....0..0..2....0..2..1....0..2..0
%e ..2..0..0....1..1..1....1..0..1....1..2..2....0..1..0....2..2..1....1..0..1
%e ..2..0..2....1..2..1....1..1..1....0..2..1....0..0..2....1..0..2....2..2..2
%e ..0..2..1....1..1..1....1..1..1....2..2..1....1..0..2....2..1..2....0..1..0
%e ..1..2..0....0..1..0....0..0..0....1..1..2....0..0..2....1..0..2....2..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 31 2011