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Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column
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%I #6 Dec 18 2015 18:18:00

%S 3,81,7891,5174065,18649387825,381916401448593,44164224032234465777

%N Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column

%C Diagonal of A207015

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 14 2012