A264953 Number of nX3 arrays containing 3 copies of 0..n-1 with no equal horizontal or vertical neighbors.

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

Offset

1,2

Comments

Column 3 of A264954.

Links

Table of n, a(n) for n=1..8.

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

Adjacent sequences: A264950 A264951 A264952 * A264954 A264955 A264956

Keyword

nonn

Author

R. H. Hardin, Nov 29 2015

Status

approved