OFFSET
1,1
COMMENTS
Diagonal of A250691
EXAMPLE
Some solutions for n=3
..3..2..1..1....3..3..1..0....2..0..0..0....3..3..2..0....1..3..1..0
..2..1..0..0....3..3..1..0....2..0..0..0....3..3..2..2....1..3..2..1
..2..1..0..0....3..3..1..1....3..1..1..1....2..2..1..1....0..2..1..0
..1..2..3..3....2..2..0..2....2..3..3..3....1..3..3..3....0..2..1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 26 2014
STATUS
approved