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%I #5 Mar 31 2012 12:37:33
%S 5689274,13085817650,29234187801911,66307681156504928,
%T 150365005774145044378,341167083547574037214431,
%U 774109750788951970050073763,1756503539641086562853516577253
%N 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having one, two or three distinct clockwise edge differences
%C Column 6 of A210355
%H R. H. Hardin, <a href="/A210353/b210353.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..1..2..1..1..0..0....3..0..1..1..1..1..3....0..1..2..3..2..2..0
%e ..1..0..3..2..1..1..0....0..3..2..2..2..3..3....2..1..1..2..1..0..2
%e ..0..0..3..3..0..1..0....1..2..2..1..1..3..2....3..0..0..1..0..0..1
%e ..1..0..3..3..3..2..2....2..1..1..2..1..1..2....0..3..3..2..3..3..2
%e ..2..1..2..3..2..1..1....3..2..2..3..1..1..1....1..2..1..1..0..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 20 2012
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