%I #4 Aug 12 2016 07:05:18
%S 1,2,91,14540,5127134,3413004556,3833960867620,6716778465903760,
%T 17318905849792010100
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its northeast neighbor modulo n and the upper left element equal to 0.
%C Column 3 of A266655.
%e Some solutions for n=4
%e ..0..3..0....0..3..2....0..0..2....0..3..0....0..3..3....0..3..2....0..3..0
%e ..1..3..2....3..1..2....0..2..3....1..2..1....3..1..0....3..2..0....3..3..2
%e ..2..1..1....0..2..3....2..3..1....2..1..0....1..2..2....0..2..1....2..1..2
%e ..0..3..2....0..1..1....1..3..1....3..2..3....0..1..2....1..1..3....1..1..0
%Y Cf. A266655.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 02 2016