OFFSET
1,2
COMMENTS
Superdiagonal 2 of A268115.
EXAMPLE
Some solutions for n=5
..0..0..1..2..2..3..4....0..0..1..1..2..2..3....0..1..2..2..3..3..4
..1..1..2..2..3..4..0....1..1..2..2..3..3..4....1..2..3..3..4..4..0
..1..2..3..3..4..0..0....2..2..2..3..4..4..0....2..2..3..4..0..0..1
..2..3..3..4..4..0..1....3..3..3..4..0..0..0....2..3..4..4..0..1..1
..2..3..4..4..0..1..1....4..4..4..0..1..1..1....2..3..4..0..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2016
STATUS
approved