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A214006
Number of n X n nonnegative integer matrices with row and column i=1..n having sum <= i*2
0
3, 54, 7722, 9318805, 98721672541, 9463992096711104, 8396505064286814402888
OFFSET
1,1
COMMENTS
Column 2 of A214011
EXAMPLE
Some solutions for n=3
..0..2..0....0..0..0....2..0..0....2..0..0....0..0..0....0..0..0....0..0..1
..0..0..0....0..0..4....0..1..0....0..0..2....0..1..0....0..4..0....0..0..3
..0..0..5....0..1..0....0..0..0....0..1..2....0..2..0....1..0..1....0..3..0
CROSSREFS
Sequence in context: A171739 A157568 A156911 * A154604 A188798 A334248
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 30 2012
STATUS
approved