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%I #7 Dec 13 2015 18:43:14
%S 373644,5593611,170170494,6593653335,269149632948,11143560422013,
%T 464729380449429,19426122492513648,813739971207123378,
%U 34104124057653666906,1430366045206364340207,59998334445467086550745
%N Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward and upward neighbors.
%C Column 6 of A206668.
%H R. H. Hardin, <a href="/A206666/b206666.txt">Table of n, a(n) for n = 1..167</a>
%e Some solutions for n=4:
%e ..0..0..1..2..0..1..2....0..1..2..2..0..0..0....0..0..2..0..1..1..1
%e ..0..1..1..2..0..1..1....1..1..1..2..2..0..1....2..2..2..0..0..0..0
%e ..1..1..2..2..0..0..0....1..2..1..1..2..0..0....1..1..2..2..2..2..2
%e ..2..2..2..0..0..1..0....2..2..1..2..2..0..2....2..1..2..0..0..2..0
%e ..2..0..2..0..1..1..2....1..2..1..1..2..2..2....2..1..2..2..2..2..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 11 2012