OFFSET
1,3
COMMENTS
Row 9 of A187857
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..50
FORMULA
Empirical: a(n) = 11710007*n^2 - 135575032*n + 380311550 for n>15
EXAMPLE
Some solutions for 4X4
..0..0..4..0....0..5..0..0....0..0..0..0....0..0..2..0....5..4..0..0
..9..0..6..3....0..4..3..7....0..5..7..6....4..0..1..8....0..3..2..1
..0..8..5..2....1..0..2..6....2..4..3..9....0..3..0..7....6..8..7..9
..0..0..7..1....0..0..9..8....1..8..0..0....0..6..5..9....0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 14 2011
STATUS
approved