A264637 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4.

2, 28, 960, 46656, 4561920, 829440000, 218972160000, 73903104000000

Offset

1,1

Comments

Column 3 of A264638.

Links

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

Example

Some solutions for n=4
..8..0..9....8..4..0....4..8..0....4.10..9....0..4..8....0..4..9....2..8..4
..6..4..1...10..5..9...10..6..1....0..6..5....6..1..5...10..8..5...10..0..5
.10..2..5....2..6..1....2..3..9....8..2..1....2..9..7....2..7..1....6.11..1
..3.11..7....7..3.11...11..7..5....3..7.11...10.11..3....6.11..3....3..7..9

Crossrefs

Cf. A264638.

Sequence in context: A370378 A009256 A012725 * A352251 A012756 A362587

Adjacent sequences: A264634 A264635 A264636 * A264638 A264639 A264640

Keyword

nonn

Author

R. H. Hardin, Nov 19 2015

Status

approved