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%I #4 Aug 12 2016 07:05:17
%S 1,0,30,2408,1477440,854084640,1480836132576,2354482052331648
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no element plus any vertical or antidiagonal neighbor equal to n-1.
%C Column 3 of A266042.
%e Some solutions for n=4
%e ..1..0..1....2..3..1....2..3..0....1..3..0....2..0..3....2..0..1....0..2..1
%e ..1..0..3....2..3..0....2..1..1....1..2..0....0..1..1....2..0..3....0..0..3
%e ..0..2..2....2..1..0....3..0..1....0..2..1....1..3..0....2..1..3....1..1..2
%e ..2..3..3....3..1..0....2..0..3....2..3..3....3..2..2....0..1..3....3..3..2
%Y Cf. A266042.
%K nonn
%O 1,3
%A _R. H. Hardin_, Dec 20 2015