OFFSET
1,2
COMMENTS
Superdiagonal 1 of A267278.
EXAMPLE
Some solutions for n=4
..0..3..2..1..0....0..2..1..3..2....0..3..2..0..0....0..3..2..1..3
..2..1..0..3..1....2..1..3..1..0....2..1..0..3..1....3..1..0..2..1
..1..3..2..0..0....0..3..1..3..2....1..3..2..1..3....0..3..1..1..3
..2..2..3..3..1....2..0..3..1..0....2..2..0..3..1....2..0..0..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2016
STATUS
approved