OFFSET
1,1
EXAMPLE
Some solutions for n=3
..3..6..1....5..0..7....0..1..6....0..2..5....5..0..0....7..0..4....5..3..3
..5..2..4....1..6..6....1..5..2....2..5..1....0..5..1....3..5..4....1..5..6
..2..3..7....6..7..1....6..2..1....5..1..3....0..1..6....1..7..5....5..4..4
CROSSREFS
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Dec 25 2011
STATUS
approved