OFFSET
1,1
COMMENTS
Diagonal of A252407
EXAMPLE
Some solutions for n=4
..0..2..2..3..2..2....3..2..2..3..2..2....3..3..1..0..3..1....3..2..2..0..2..2
..3..1..3..3..1..3....3..1..3..3..1..3....3..2..2..3..2..2....2..3..2..2..3..2
..2..2..3..2..2..0....2..2..3..2..2..3....2..3..2..2..3..2....0..3..1..3..0..1
..3..2..2..0..2..2....3..2..2..0..2..2....3..0..1..3..3..1....3..2..2..3..2..2
..0..1..3..3..1..3....3..1..3..3..1..3....3..2..2..0..2..2....2..0..2..2..3..2
..2..2..3..2..2..3....2..2..0..2..2..3....2..3..2..2..3..2....3..3..1..3..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2014
STATUS
approved