%I #4 Aug 12 2016 07:05:18

%S 1,0,17,1304,530368,358960340,415907473523,746349711489188,

%T 1963150997018131136

%N Number of nX3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its west or northeast neighbor modulo n and the upper left element equal to 0.

%C Column 3 of A266867.

%e Some solutions for n=4

%e ..0..3..2....0..3..1....0..3..1....0..3..1....0..2..1....0..2..2....0..2..0

%e ..3..1..0....2..1..0....1..0..3....1..1..3....0..0..3....2..1..3....2..0..3

%e ..3..2..1....1..0..3....0..3..2....0..2..2....2..1..3....3..1..0....2..1..1

%e ..2..1..0....3..2..2....2..2..1....2..0..3....3..2..1....1..0..3....1..3..3

%Y Cf. A266867.

%K nonn

%O 1,3

%A _R. H. Hardin_, Jan 04 2016