OFFSET
1,1
COMMENTS
Diagonal of A237557
EXAMPLE
Some solutions for n=3
..2..2..0..0....1..1..2..0....2..1..1..0....1..0..0..0....1..0..0..2
..2..1..0..2....1..0..1..2....1..2..1..0....0..0..0..1....2..0..0..1
..1..0..1..1....2..1..0..0....0..1..2..0....2..0..1..0....2..0..1..0
..0..1..2..2....2..0..2..0....1..1..1..2....1..1..0..0....0..1..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 09 2014
STATUS
approved