%I #4 Aug 12 2016 07:05:17
%S 1,0,6,964,289569,188978578,207181732018,357677449791820,
%T 912613747687355713
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its north or northeast neighbor modulo n and the upper left element equal to 0.
%C Column 3 of A266599.
%e Some solutions for n=4
%e ..0..3..0....0..0..1....0..1..2....0..2..3....0..2..2....0..0..2....0..1..0
%e ..2..2..2....0..3..3....0..1..1....0..1..1....2..1..1....2..0..1....3..3..3
%e ..1..1..0....3..2..2....3..0..3....3..0..3....0..1..0....2..3..1....2..1..2
%e ..1..3..3....1..1..2....2..2..3....2..2..1....3..3..3....1..3..3....1..0..2
%Y Cf. A266599.
%K nonn
%O 1,3
%A _R. H. Hardin_, Jan 01 2016