OFFSET
1,1
COMMENTS
Diagonal of A231023
EXAMPLE
Some solutions for n=2
..x..0..x..1..x....x..0..x..2..x....x..0..x..3..x....x..0..x..0..x
..1..x..3..x..2....2..x..1..x..3....1..x..0..x..2....3..x..1..x..0
..x..2..x..3..x....x..3..x..0..x....x..2..x..1..x....x..2..x..1..x
..1..x..0..x..2....0..x..2..x..3....1..x..3..x..1....1..x..0..x..2
..x..3..x..1..x....x..1..x..2..x....x..0..x..2..x....x..3..x..3..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 03 2013
STATUS
approved