OFFSET
1,2
COMMENTS
Diagonal of A210143
EXAMPLE
Some solutions for n=4
..0..1..1..2..2....0..0..0..0..1....0..0..0..0..0....0..0..1..1..0
..3..2..1..1..1....0..2..2..2..3....0..0..0..0..0....2..2..3..1..0
..0..1..1..3..3....1..3..2..2..2....0..0..0..0..0....3..2..3..3..2
..1..0..1..1..1....3..1..0..2..1....0..0..0..0..0....0..1..0..3..2
..1..0..0..0..1....1..1..0..2..1....1..0..2..0..3....0..1..0..3..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 17 2012
STATUS
approved