A269645 Number of nX3 arrays containing 3 copies of 0..n-1 avoiding the pattern down-up in every row and equal-up in every column.

1, 14, 574, 68876, 18375702, 9213264418, 7725775442284

Offset

1,2

Comments

Column 3 of A269646.

Links

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

Example

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

Crossrefs

Cf. A269646.

Sequence in context: A361695 A349766 A269478 * A232369 A218412 A129007

Adjacent sequences: A269642 A269643 A269644 * A269646 A269647 A269648

Keyword

nonn

Author

R. H. Hardin, Mar 02 2016

Status

approved