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%I #4 Aug 12 2016 07:05:17
%S 1,1,39,8190,3264584,2357929910,2805027363620,5125417483461520,
%T 13647329614464753200
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its west neighbor modulo n and the upper left element equal to 0.
%C Column 3 of A266309.
%e Some solutions for n=4
%e ..0..3..3....0..2..1....0..0..3....0..2..2....0..2..2....0..3..1....0..0..2
%e ..1..1..3....1..3..3....0..3..2....3..1..3....3..1..3....1..0..3....3..3..2
%e ..2..0..2....0..0..2....1..1..1....0..2..1....1..1..0....2..2..0....1..3..2
%e ..2..1..0....1..3..2....3..2..2....0..3..1....0..3..2....3..2..1....1..1..0
%Y Cf. A266309.
%K nonn
%O 1,3
%A _R. H. Hardin_, Dec 26 2015