A212936 Number of 7Xn 0..n-1 arrays with no column j greater than column j-1 in all rows.

1, 16383, 10450787266, 71832238695530495, 2891333179750701904296876, 475997448692406224810330915906802, 252848108054080530934326716965286554552380

Offset

1,2

Comments

Row 7 of A212930

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for n=3
..2..0..2....0..2..2....0..0..0....1..2..0....0..1..1....2..0..0....2..0..1
..2..0..2....1..1..2....1..0..2....1..2..2....2..2..2....0..2..0....0..0..2
..2..0..1....2..1..2....1..1..1....0..0..1....1..0..0....0..1..1....1..1..2
..2..1..2....0..1..1....2..0..2....1..2..0....0..0..1....1..0..1....0..0..1
..1..2..1....2..1..1....2..0..1....1..2..1....2..1..0....2..2..1....2..2..2
..0..2..1....0..1..2....1..0..1....2..2..0....0..2..0....0..1..1....1..2..1
..1..1..2....0..1..1....1..1..1....0..0..2....0..2..1....0..0..2....0..2..2

Crossrefs

Sequence in context: A161117 A069389 A069415 * A069275 A216074 A258736

Adjacent sequences: A212933 A212934 A212935 * A212937 A212938 A212939

Keyword

nonn

Author

R. H. Hardin, May 31 2012

Status

approved