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