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%I #6 Mar 31 2012 12:37:30
%S 71,12161,14922177,131724081683,8356768819356343,
%T 3811099763671947037073,12493316536665519357482808705,
%U 294391907024716464395174365141711571,49864726192803453135807335081496483729871063
%N Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences
%C Diagonal of A209960
%H R. H. Hardin, <a href="/A209952/b209952.txt">Table of n, a(n) for n = 1..12</a>
%e Some solutions for n=4
%e ..2..1..2..1..0....0..2..1..2..2....0..0..1..1..0....2..1..0..2..2
%e ..1..1..1..1..1....2..2..1..1..1....0..1..1..2..2....0..0..2..1..0
%e ..1..1..1..0..2....1..0..0..0..0....2..0..1..2..0....1..2..1..1..0
%e ..2..1..2..2..2....1..1..1..0..2....1..1..1..1..0....2..2..2..0..2
%e ..2..1..2..1..1....1..2..1..1..1....1..1..2..2..2....2..0..1..2..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 16 2012
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