%I #4 Oct 28 2013 08:18:27
%S 3956,173428,8053490,342031378,14669811856,625553036008,
%T 26681634560690,1137681116923966,48508501856178526,
%U 2068224674692996586,88181384650502245634,3759701430154725238638,160298702553771350622996
%N Number of (n+3)X(7+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero
%C Column 7 of A230708
%H R. H. Hardin, <a href="/A230707/b230707.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=2
%e ..0..x..0..x..2..x..1..x..1..x....0..x..1..x..1..x..2..x..1..x
%e ..x..1..x..1..x..0..x..2..x..0....x..1..x..2..x..2..x..0..x..2
%e ..0..x..2..x..2..x..0..x..2..x....2..x..1..x..0..x..1..x..0..x
%e ..x..2..x..0..x..1..x..2..x..1....x..0..x..1..x..2..x..0..x..1
%e ..1..x..1..x..0..x..0..x..0..x....2..x..2..x..1..x..1..x..2..x
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 28 2013