OFFSET
1,3
COMMENTS
Diagonal of A215924
EXAMPLE
Some solutions for n=4
..x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..0
..1..x..2..x....1..x..2..x....2..x..3..x....1..x..2..x....1..x..2..x
..x..0..x..0....x..3..x..1....x..0..x..0....x..0..x..1....x..0..x..0
..3..x..2..x....4..x..4..x....4..x..1..x....3..x..4..x....3..x..1..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 27 2012
STATUS
approved