OFFSET
1,1
COMMENTS
Diagonal of A206752.
EXAMPLE
Some solutions for n=4:
..0..0..0..0..1....2..2..3..0..3....0..0..3..0..0....1..0..0..0..0
..0..1..0..3..0....3..2..2..3..0....1..1..0..3..3....3..1..0..1..0
..2..3..1..0..0....1..3..2..3..3....3..3..1..0..3....1..3..1..3..1
..2..2..3..2..0....1..3..3..3..0....1..1..3..1..0....1..1..3..0..2
..0..0..1..3..2....3..2..2..2..3....0..1..1..2..1....0..0..1..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 12 2012
STATUS
approved