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

Author

R. H. Hardin, Jun 30 2012

Keywords

• nonn
• more

Comments

Column 1 of A214011.

Examples

			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.