OFFSET
1,2
EXAMPLE
Some solutions for 4X4
..1..1..1..3....0..0..2..2....1..4..3..4....4..3..2..4....1..1..2..2
..1..4..2..3....0..1..1..1....4..4..2..3....3..0..0..2....1..3..3..1
..1..2..4..4....2..1..1..1....3..2..1..1....2..0..4..3....2..3..0..0
..3..3..4..1....2..1..1..1....4..3..1..1....4..2..3..4....2..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 27 2011
STATUS
approved