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

1,1

Comments

Column 7 of A221438

Links

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

Example

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

Crossrefs

Sequence in context: A158050 A063411 A008552 * A221622 A318714 A227669

Adjacent sequences: A221434 A221435 A221436 * A221438 A221439 A221440

Keyword

nonn

Author

R. H. Hardin Jan 16 2013

Status

approved