OFFSET
0,2
EXAMPLE
Some solutions for n=4
.....2........2........3........0........1........0........0........2...
....1.0......2.0......0.0......0.0......0.0......0.0......0.0......0.1..
...0.0.0....0.0.1....2.0.0....1.1.0....0.1.1....1.0.2....1.1.0....2.0.0.
..2.0.1.2..1.1.1.2..2.0.0.5..0.0.0.3..2.0.1.2..1.2.0.1..3.0.0.2..0.0.0.3
------
.....1........1........0........0........1........3........2........1...
....0.0......0.1......1.2......2.0......0.0......0.0......0.2......0.0..
...2.0.2....0.0.1....0.0.1....2.0.0....0.3.0....0.0.0....1.0.0....0.0.2.
..0.0.0.1..1.0.0.1..0.0.1.1..1.0.1.3..1.0.0.2..3.0.0.0..1.1.1.0..0.2.0.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 09 2009
STATUS
approved