OFFSET
1,2
COMMENTS
Row 4 of A268142.
EXAMPLE
Some solutions for n=4
..0..0..2..1....0..3..2..3....0..1..1..2....0..3..0..3....0..1..2..3
..0..0..1..2....3..0..3..2....1..0..2..1....3..0..3..0....1..0..3..2
..3..3..2..1....2..0..1..1....3..3..2..0....2..1..2..1....0..3..2..1
..3..3..1..2....0..2..1..1....3..3..0..2....1..2..1..2....3..0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2016
STATUS
approved