OFFSET
1,2
COMMENTS
Diagonal of A208434.
EXAMPLE
Some solutions for n=4
..0..0..0..1....0..0..0..1....0..0..0..1....0..0..1..2....0..0..0..1
..1..2..1..1....1..2..1..1....1..0..1..2....0..1..1..1....1..2..1..1
..2..2..2..1....2..2..2..1....2..1..2..1....2..2..1..0....2..2..2..1
..1..2..0..0....1..0..0..0....1..2..1..0....0..2..0..0....0..2..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 26 2012
STATUS
approved