OFFSET
1,3
COMMENTS
Column 3 of A266042.
EXAMPLE
Some solutions for n=4
..1..0..1....2..3..1....2..3..0....1..3..0....2..0..3....2..0..1....0..2..1
..1..0..3....2..3..0....2..1..1....1..2..0....0..1..1....2..0..3....0..0..3
..0..2..2....2..1..0....3..0..1....0..2..1....1..3..0....2..1..3....1..1..2
..2..3..3....3..1..0....2..0..3....2..3..3....3..2..2....0..1..3....3..3..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 20 2015
STATUS
approved