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%I #5 Aug 12 2016 07:05:16
%S 1,1,20,1129,104241,14031233,2641322440,663690698065,214585916901953
%N Number of nX3 arrays containing 3 copies of 0..n-1 with no equal diagonal or antidiagonal neighbors and new values introduced sequentially from 0.
%C Column 3 of A265656.
%e Some solutions for n=4
%e ..0..1..2....0..0..1....0..1..2....0..0..1....0..1..2....0..1..2....0..1..2
%e ..3..3..0....2..2..3....3..3..3....2..2..3....0..3..3....2..1..3....3..1..3
%e ..2..2..1....3..0..1....2..0..2....1..1..3....2..2..0....0..1..3....2..2..0
%e ..1..3..0....3..2..1....1..0..1....3..2..0....3..1..1....3..2..0....3..1..0
%Y Cf. A265656.
%K nonn
%O 1,3
%A _R. H. Hardin_, Dec 12 2015
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