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