OFFSET
1,1
COMMENTS
Diagonal of A250620
EXAMPLE
Some solutions for n=2
..1..1..1....1..2..0....0..1..2....1..2..1....2..2..1....0..1..0....1..1..1
..0..2..0....1..0..1....2..1..2....2..2..0....2..2..0....1..2..1....2..2..1
..1..0..1....0..2..0....1..0..1....1..1..1....1..2..1....2..0..2....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 26 2014
STATUS
approved