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A264953
Number of nX3 arrays containing 3 copies of 0..n-1 with no equal horizontal or vertical neighbors.
0
0, 2, 36, 10728, 4857120, 4099655520, 5589688315680, 11532215497783680
OFFSET
1,2
COMMENTS
Column 3 of A264954.
EXAMPLE
Some solutions for n=4
..3..1..2....3..2..0....0..3..1....1..0..2....1..3..1....2..0..3....0..3..0
..1..3..0....2..1..2....1..0..2....0..2..3....0..1..2....1..3..1....3..0..1
..0..1..2....3..0..1....2..3..0....3..1..0....2..3..0....3..0..2....2..1..2
..2..3..0....1..3..0....3..1..2....1..3..2....3..0..2....2..1..0....1..2..3
CROSSREFS
Cf. A264954.
Sequence in context: A060739 A333209 A224733 * A308942 A134366 A265944
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 29 2015
STATUS
approved