OFFSET
1,1
EXAMPLE
Some solutions for n=5
..0..0..1..0..1..1....0..1..0..1..0..0....0..1..1..2..1..1....0..0..1..0..2..0
..2..0..2..2..1..0....0..1..1..2..3..2....0..2..0..3..0..0....0..0..1..1..0..1
..3..2..2..0..2..3....3..0..1..2..1..1....2..1..1..0..2..1....3..3..2..2..3..1
..3..0..1..2..3..3....2..1..2..3..0..1....0..1..0..2..2..1....3..0..2..0..2..2
..0..1..1..2..3..0....2..0..0..1..3..0....0..3..1..0..1..0....0..0..1..0..3..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 22 2012
STATUS
approved