OFFSET
1,1
COMMENTS
Diagonal of A222931
EXAMPLE
Some solutions for n=3
..2..1..2....3..2..1....3..0..1....3..1..0....1..0..0....1..1..0....2..0..0
..0..0..1....0..3..0....3..2..2....3..2..1....0..2..0....1..3..1....2..0..1
..1..1..3....1..3..3....2..0..2....0..0..3....1..1..2....0..3..3....0..1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 09 2013
STATUS
approved