%I #4 Aug 12 2016 07:05:15

%S 0,2,36,10728,4857120,4099655520,5589688315680,11532215497783680

%N Number of nX3 arrays containing 3 copies of 0..n-1 with no equal horizontal or vertical neighbors.

%C Column 3 of A264954.

%e Some solutions for n=4

%e ..3..1..2....3..2..0....0..3..1....1..0..2....1..3..1....2..0..3....0..3..0

%e ..1..3..0....2..1..2....1..0..2....0..2..3....0..1..2....1..3..1....3..0..1

%e ..0..1..2....3..0..1....2..3..0....3..1..0....2..3..0....3..0..2....2..1..2

%e ..2..3..0....1..3..0....3..1..2....1..3..2....3..0..2....2..1..0....1..2..3

%Y Cf. A264954.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 29 2015