A221437 Number of nX7 1..(max n,7) arrays with each row and column having unrepeated values.

5040, 9344160, 5411750400, 782137036800, 20449013760000, 61479419904000, 61479419904000

Offset: 1

Author

R. H. Hardin Jan 16 2013

Keywords

• nonn

Comments

Column 7 of A221438

Examples

			Some solutions for n=2
..1..2..3..4..5..6..7....1..3..5..2..6..4..7....1..2..3..4..7..6..5
..2..7..1..3..6..4..5....2..5..6..4..3..7..1....2..4..6..1..5..3..7