OFFSET
1,2
COMMENTS
Diagonal of A267019.
EXAMPLE
Some solutions for n=4
..0..3..1..3....0..1..3..2....0..2..0..1....0..3..1..2....0..2..0..3
..3..1..0..2....1..0..2..3....2..0..2..1....3..1..3..1....2..1..3..1
..2..0..2..0....1..2..0..3....0..3..1..3....2..0..1..3....1..3..1..0
..1..3..1..2....2..1..3..0....3..1..3..2....0..2..0..2....3..2..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 09 2016
STATUS
approved