OFFSET
1,1
COMMENTS
Diagonal of A218651.
EXAMPLE
Some solutions for n=3
..1..1..3....0..0..1....2..2..3....0..0..3....3..1..1....1..1..1....3..2..2
..1..1..3....0..0..2....1..1..2....0..2..0....1..1..0....1..1..2....3..2..2
..1..1..3....0..3..3....1..1..2....2..0..0....1..0..0....3..2..2....3..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 03 2012
STATUS
approved