OFFSET
1,1
COMMENTS
Diagonal of A231663
EXAMPLE
Some solutions for n=3
..2..1..0....0..2..0....1..0..1....2..0..0....0..1..0....1..0..0....2..0..0
..0..0..0....0..0..0....0..0..2....1..0..0....0..0..0....0..0..0....0..0..0
..0..2..1....2..2..0....0..1..1....1..2..0....2..2..1....1..2..0....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 12 2013
STATUS
approved