OFFSET
1,3
COMMENTS
Row 8 of A187286
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..50
FORMULA
Empirical: a(n) = 708492*n^2 - 5580668*n + 10074432 for n>13
EXAMPLE
Some solutions for 4X4
..0..5..1..0....0..5..6..0....5..4..6..3....0..0..0..6....3..2..0..1
..0..6..2..0....8..4..7..3....0..0..7..1....0..8..0..7....0..0..0..0
..0..4..3..0....0..0..0..2....0..0..8..2....0..3..4..5....4..0..0..8
..0..7..0..8....0..0..0..1....0..0..0..0....0..2..1..0....5..6..0..7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 08 2011
STATUS
approved