A268471 Number of nX3 arrays containing 3 copies of 0..n-1 with column sums equal.

1, 8, 216, 19584, 4140000, 1936704000, 1610574336000, 2195571603456000

Offset

1,2

Comments

Column 3 of A268472.

Links

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

Example

Some solutions for n=4
..2..3..3. .3..2..1. .0..1..2. .2..0..1. .1..3..2. .0..3..2. .3..2..1
..1..0..2. .1..3..0. .3..2..0. .3..1..2. .2..0..1. .1..3..1. .0..1..0
..3..1..1. .0..0..2. .2..0..1. .1..3..3. .1..3..0. .2..0..1. .1..3..3
..0..2..0. .2..1..3. .1..3..3. .0..2..0. .2..0..3. .3..0..2. .2..0..2

Crossrefs

Cf. A268472.

Sequence in context: A024289 A009106 A000442 * A342598 A226524 A359412

Adjacent sequences: A268468 A268469 A268470 * A268472 A268473 A268474

Keyword

nonn

Author

R. H. Hardin, Feb 05 2016

Status

approved