A211708 Number of n X 3 nonnegative integer arrays with new values 0 upwards introduced in row major order and every value unique in its row and column.

1, 18, 588, 30240, 2277600, 234440280, 31448589480

Offset: 1

Author

R. H. Hardin, Apr 19 2012

Keywords

• nonn

Comments

Column 3 of A211709.

Examples

			Some solutions for n=4:
..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..2..3..0....1..3..0....1..0..3....3..0..1....1..0..3....1..0..3....1..0..3
..1..2..3....2..0..1....2..3..0....1..2..0....3..2..1....2..3..4....2..3..1
..3..0..1....3..4..5....3..2..1....2..3..4....2..3..0....3..5..6....3..2..0