A269504 Number of nX3 arrays containing 3 copies of 0..n-1 avoiding the pattern down-up in every row and column.

1, 14, 420, 18332, 1261420, 134871120, 21338020496

Offset

1,2

Comments

Column 3 of A269505.

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Cf. A269505.

Sequence in context: A275025 A236156 A258392 * A033815 A187358 A103916

Adjacent sequences: A269501 A269502 A269503 * A269505 A269506 A269507

Keyword

nonn

Author

R. H. Hardin, Feb 28 2016

Status

approved