OFFSET
1,1
COMMENTS
Column 4 of A221269
EXAMPLE
Some solutions for n=3
..2..0..2..0....0..2..1..0....0..2..2..0....0..0..0..1....2..1..1..0
..0..2..1..0....0..2..1..2....0..0..2..0....1..2..2..2....1..1..1..0
..2..2..1..0....2..0..0..2....0..2..2..2....2..1..0..1....2..0..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 08 2013
STATUS
approved