OFFSET
1,1
COMMENTS
Diagonal of A252015
EXAMPLE
Some solutions for n=4
..2..3..1..2..3..1....1..3..2..1..0..2....3..1..2..0..1..0....2..0..1..2..3..1
..3..2..1..0..2..1....0..1..2..3..1..2....2..1..3..2..1..0....2..1..3..2..1..0
..1..1..1..1..1..1....2..2..2..2..2..2....1..1..1..1..1..1....2..2..2..2..2..2
..2..3..1..2..0..1....1..0..2..1..3..2....0..1..2..3..1..2....2..0..1..2..0..1
..0..2..1..3..2..1....3..1..2..0..1..2....0..1..0..2..1..3....2..1..3..2..1..0
..1..1..1..1..1..1....2..2..2..2..2..2....1..1..1..1..1..1....2..2..2..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 12 2014
STATUS
approved