A214005 Number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i.

2, 12, 271, 24950, 9800058, 16942485560, 131898088386405, 4704783844260626244

Offset

1,1

Comments

Column 1 of A214011.

Links

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

Example

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

Crossrefs

Cf. A214011.

Sequence in context: A289314 A091504 A098137 * A014982 A012444 A012754

Adjacent sequences: A214002 A214003 A214004 * A214006 A214007 A214008

Keyword

nonn,more

Author

R. H. Hardin, Jun 30 2012

Status

approved