OFFSET
1,2
COMMENTS
Row 4 of A221655
EXAMPLE
Some solutions for n=3
..1..2..1....0..2..1....0..2..1....0..2..1....0..2..1....1..2..0....1..0..0
..0..2..0....0..3..1....0..1..1....0..2..1....0..3..0....0..3..0....1..4..1
..0..0..1....1..1..0....1..4..0....0..2..1....1..1..0....1..1..1....0..2..0
..1..4..0....0..2..1....0..1..1....1..2..0....2..2..0....0..2..1....1..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 21 2013
STATUS
approved