OFFSET
1,2
COMMENTS
Column 4 of A221341
EXAMPLE
Some solutions for n=3
..1..1..1..1....0..2..1..2....0..1..1..2....2..2..2..0....1..2..0..0
..0..1..2..0....1..2..0..2....1..2..1..1....1..0..0..2....1..1..2..0
..0..2..2..1....1..0..1..0....0..0..1..2....1..1..1..0....2..2..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 11 2013
STATUS
approved