OFFSET
1,3
COMMENTS
Diagonal of A206396.
EXAMPLE
Some solutions for n=4
..0..1..2..0....0..1..2..3....0..1..2..0....0..1..2..3....0..1..2..3
..2..3..4..1....3..4..5..0....2..3..4..5....2..3..4..5....4..3..5..4
..1..5..0..2....1..0..3..1....4..5..0..1....4..5..0..1....5..2..0..1
..4..2..3..4....2..5..4..2....0..1..2..3....3..1..2..3....0..1..4..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 07 2012
STATUS
approved