A214008 Number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*4

5, 375, 564041, 17609835599, 11798463876314995

Offset

1,1

Comments

Column 4 of A214011

Links

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

Example

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

Crossrefs

Sequence in context: A354831 A072172 A278364 * A208094 A273397 A261433

Adjacent sequences: A214005 A214006 A214007 * A214009 A214010 A214011

Keyword

nonn

Author

R. H. Hardin Jun 30 2012

Status

approved