OFFSET
1,1
COMMENTS
Diagonal of A207989
EXAMPLE
Some solutions for n=4
..1..1..1..0....0..2..0..0....2..1..2..2....0..2..0..2....0..2..0..1
..1..2..2..2....0..1..2..0....2..2..1..2....2..2..0..2....2..0..1..1
..0..1..2..2....1..0..2..0....0..2..0..2....2..0..1..2....0..2..1..1
..2..0..0..1....0..2..1..2....0..0..2..1....0..2..1..0....2..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 22 2012
STATUS
approved