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%I #4 Aug 12 2016 07:05:17
%S 1,0,8,614,203051,136141422,155788295580,278117694864594,
%T 729114712023875491
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its west or north neighbor modulo n and the upper left element equal to 0.
%C Column 3 of A266318.
%e Some solutions for n=4
%e ..0..3..2....0..3..1....0..0..2....0..3..1....0..3..2....0..3..2....0..3..2
%e ..3..2..1....3..2..0....2..2..1....2..1..0....3..3..1....0..3..1....3..1..1
%e ..1..0..3....1..0..2....1..1..3....2..0..3....2..2..1....0..2..1....3..1..0
%e ..0..2..1....1..3..2....0..3..3....1..3..2....1..0..0....3..2..1....2..0..2
%Y Cf. A266318.
%K nonn
%O 1,3
%A _R. H. Hardin_, Dec 27 2015
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