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A193609 Number of n X n symmetric 0..2 arrays with no element equal to the sum mod 3 of all its horizontal and vertical neighbors 1

%I

%S 2,6,64,1026,32832,2097152,268435456,68719348224,35184372089856,

%T 36028797018963968,73786976297388343296

%N Number of n X n symmetric 0..2 arrays with no element equal to the sum mod 3 of all its horizontal and vertical neighbors

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 31 2011

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Last modified May 27 16:48 EDT 2022. Contains 354110 sequences. (Running on oeis4.)