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%I #5 Aug 12 2016 07:05:17
%S 1,2,88,7768,4027960,2437859280,3971117183616,6584104013616000
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no element plus any diagonal or antidiagonal neighbor equal to n-1.
%C Column 3 of A266183.
%e Some solutions for n=4
%e ..3..2..2....1..2..1....2..1..3....1..0..1....3..1..2....3..3..2....1..0..3
%e ..3..2..0....3..0..2....3..2..1....2..3..0....3..2..1....1..3..2....1..3..2
%e ..0..1..3....0..3..2....0..1..0....3..0..3....0..1..0....2..0..1....2..0..3
%e ..0..1..1....3..0..1....3..2..0....2..2..1....3..2..0....0..0..1....0..2..1
%Y Cf. A266183.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 23 2015
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