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A193481 Number of n X n symmetric 0..2 arrays with each element equal to the product mod 3 of two of its horizontal and vertical neighbors 0

%I

%S 0,2,8,127,3686,285929,47398400,18127384939,15993244772677,

%T 32531416116323498,152344987111028997103,1640044640940871976733780

%N Number of n X n symmetric 0..2 arrays with each element equal to the product mod 3 of two of its horizontal and vertical neighbors

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jul 27 2011

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Last modified August 19 16:39 EDT 2022. Contains 356229 sequences. (Running on oeis4.)