A264559 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 3.

2, 24, 888, 58368, 7019136, 1202698368

Offset

1,1

Comments

Column 3 of A264560.

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
..0..6..3....9..1..3...10..6..3....6..0..3....9..7..3....3.11..9....6..0.10
.10..4..9....0..4..2....7..9..1....1..5..9....0..4..6....6..8..0....3..9..7
..1..7..5....6..7.11....4..0..5....4..8..7...10..2..8....7..5..1....5.11..1
..2..8.11...10..8..5....8..2.11...10..2.11....1..5.11...10..2..4....8..2..4

Crossrefs

Cf. A264560.

Sequence in context: A339946 A172492 A322895 * A012186 A012081 A137274

Adjacent sequences: A264556 A264557 A264558 * A264560 A264561 A264562

Keyword

nonn

Author

R. H. Hardin, Nov 17 2015

Status

approved