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

Author

R. H. Hardin Jun 30 2012

Keywords

• nonn

Comments

Column 3 of A214011

Examples

			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