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1/81 the number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor
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%I #5 Mar 31 2012 12:35:54

%S 1,162,163208,1042063656,41531687999736,10425296660739253420

%N 1/81 the number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor

%C Diagonal of A183819

%e Some solutions with upper left block zero for 3X3

%e ..0..0..2....0..0..0....0..0..2....0..0..0....0..0..2....0..0..0....0..0..0

%e ..0..0..0....0..0..1....0..0..1....0..0..2....0..0..2....0..0..1....0..0..1

%e ..2..2..0....0..1..2....1..1..1....1..1..1....1..2..1....2..0..1....1..2..1

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 07 2011