OFFSET
1,1
COMMENTS
Diagonal of A217645
EXAMPLE
Some solutions for n=3
..1..1..1....2..2..2....2..2..1....1..0..0....0..0..0....2..2..1....2..2..1
..1..1..2....2..1..0....0..0..0....1..0..0....0..0..0....2..1..0....1..1..1
..1..2..2....1..0..0....0..0..0....1..2..2....0..2..2....1..0..0....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 09 2012
STATUS
approved