A214007 Number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*3

4, 160, 85639, 641631566, 69768979161580, 113333423255541329550

Offset

1,1

Comments

Column 3 of A214011

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A224275 A224198 A104133 * A248330 A157463 A041779

Adjacent sequences: A214004 A214005 A214006 * A214008 A214009 A214010

Keyword

nonn

Author

R. H. Hardin Jun 30 2012

Status

approved