OFFSET
1,1
COMMENTS
Diagonal of A207290
EXAMPLE
Some solutions for n=4
..0..2..2..1....2..2..1..0....1..3..2..1....0..1..0..3....1..3..0..1
..1..0..1..1....3..2..2..0....1..1..0..3....2..2..1..2....0..0..1..0
..3..2..1..0....2..3..0..0....2..3..3..0....1..1..3..2....0..1..1..3
..0..3..0..0....1..2..0..2....0..2..1..3....0..3..3..0....3..0..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 16 2012
STATUS
approved