OFFSET
1,3
COMMENTS
Diagonal of A199201.
EXAMPLE
Some solutions for n=4
..0..1..2..1....0..1..0..2....0..1..0..2....0..1..0..1....0..1..2..0
..3..2..0..2....2..3..2..0....2..0..3..1....1..2..3..0....3..2..1..3
..0..1..3..0....3..1..3..1....3..1..2..0....2..3..0..3....0..1..3..1
..2..3..1..3....2..0..1..3....2..3..1..3....3..2..1..2....2..0..2..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 03 2011
STATUS
approved