%I
%S 1,0,39,6152,2079765,1362641028,1511484069811,2623713101882928,
%T 6717410044413848265
%N Number of nX3 arrays containing 3 copies of 0..n1 with no element 1 greater than its north neighbor modulo n and the upper left element equal to 0.
%C Column 3 of A266455.
%e Some solutions for n=4
%e ..0..1..1....0..3..1....0..1..3....0..1..2....0..3..2....0..3..2....0..3..1
%e ..3..3..0....2..1..1....3..0..1....2..0..2....2..3..2....2..1..1....3..2..0
%e ..3..2..0....0..3..3....3..2..0....1..0..1....1..1..0....1..0..3....3..1..0
%e ..1..2..2....0..2..2....1..2..2....3..3..3....1..0..3....3..0..2....2..1..2
%Y Cf. A266455.
%K nonn
%O 1,3
%A _R. H. Hardin_, Dec 29 2015
