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