OFFSET
1,2
COMMENTS
Diagonal of A187140
EXAMPLE
Some solutions for 4X4
..0..1..1..0....0..1..2..0....2..1..1..0....1..0..2..0....2..1..1..0
..1..1..1..1....1..2..2..2....2..1..0..0....2..1..1..1....1..1..2..2
..1..0..0..0....0..1..1..2....0..1..0..1....0..0..0..2....2..2..1..0
..0..1..2..2....0..2..2..2....1..2..1..2....2..2..1..1....0..2..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 05 2011
STATUS
approved