OFFSET
1,2
COMMENTS
Diagonal of A210267
EXAMPLE
Some solutions for n=4
..0..0..0..0..0....0..0..1..0..0....0..0..0..0..0....0..1..0..2..1
..1..2..3..2..3....2..3..0..2..3....1..2..1..2..1....3..0..3..2..0
..3..2..0..0..0....3..0..1..2..0....0..2..3..3..3....2..2..0..3..3
..1..2..3..2..3....2..3..1..3..2....1..2..0..2..0....3..0..3..2..1
..0..2..1..1..1....3..0..3..2..0....1..3..0..1..1....3..1..3..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 19 2012
STATUS
approved