OFFSET
1,1
COMMENTS
Diagonal of A228977.
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..2
..0..0..2..1....0..0..2..1....0..0..1..0....0..0..0..0....0..0..0..1
..1..2..1..1....1..2..2..2....2..0..1..2....1..1..1..1....0..2..2..2
..2..0..1..1....2..0..0..0....1..0..2..1....2..2..1..0....1..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 10 2013
STATUS
approved