A214009 Number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*5

6, 756, 2663506, 269462676001, 807203255071567008

Offset

1,1

Comments

Column 5 of A214011

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for n=3
..2..0..0....1..0..0....0..0..5....0..0..0....0..0..0....4..0..0....0..0..3
..0..9..1....0..8..0....0..0..0....0..1..9....0..4..0....0..0..8....0..0..0
..0..0..9....0..1..1....0..4..9....1..7..2....0..6..0....0..1..1....0..6..4

Crossrefs

Sequence in context: A251810 A283787 A130688 * A332176 A088217 A242850

Adjacent sequences: A214006 A214007 A214008 * A214010 A214011 A214012

Keyword

nonn

Author

R. H. Hardin Jun 30 2012

Status

approved