%I
%S 1,810,362648,83049596,19914461784,5191761888989,1343321735549790,
%T 345412651608406381,89264849660965978156,23113820838413136068578,
%U 5981531421021641392319948,1547617761143017432765908639
%N Number of nX6 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors
%C Column 6 of A203846
%H R. H. Hardin, <a href="/A203844/b203844.txt">Table of n, a(n) for n = 1..22</a>
%e Some solutions for n=4
%e ..1..3..3..0..3..3....0..2..2..3..3..0....0..3..3..1..2..2....1..1..2..2..2..0
%e ..2..3..3..1..3..3....0..2..3..3..3..1....0..3..3..3..2..2....3..3..2..0..2..0
%e ..3..3..1..0..3..2....3..3..3..0..0..1....0..0..3..3..0..1....3..3..1..2..2..0
%e ..3..3..3..3..3..2....3..3..1..1..1..1....0..0..1..1..1..1....3..3..0..2..2..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 06 2012
