%I #5 Mar 31 2012 12:37:22
%S 187,648569,2468504665,9402035642924,35810971705853725,
%T 136398703432330477549,519522527116810577984260,
%U 1978784616446414312287693835,7536898505819261464135073030914
%N Number of nX6 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors
%C Column 6 of A208201
%H R. H. Hardin, <a href="/A208199/b208199.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..1..1..1..0..0....0..0..0..0..0..1....0..0..0..0..0..0....0..1..1..0..0..0
%e ..0..1..0..1..0..1....0..1..2..1..3..2....0..1..1..0..2..1....0..1..2..3..2..1
%e ..0..1..1..1..0..2....1..3..0..3..1..0....0..1..0..2..2..1....1..1..0..3..2..3
%e ..3..0..1..2..1..1....2..1..0..3..3..3....0..3..1..0..1..0....3..0..0..2..1..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 24 2012