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