OFFSET
1,2
COMMENTS
Column 5 of A221400
EXAMPLE
Some solutions for n=3
..0..1..0..2..0....1..1..0..2..0....1..1..1..1..0....1..2..1..1..1
..1..1..0..2..2....0..1..2..1..1....1..2..0..2..0....1..2..0..2..1
..1..1..2..2..0....0..2..1..2..1....0..2..2..1..1....1..2..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2013
STATUS
approved