OFFSET
1,1
COMMENTS
Row 7 of A216612
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..1
..1..x..2..x....1..x..2..x....1..x..2..x....1..x..2..x....1..x..2..x
..x..0..x..1....x..0..x..3....x..0..x..3....x..0..x..3....x..0..x..3
..1..x..3..x....2..x..4..x....3..x..4..x....3..x..2..x....4..x..1..x
..x..4..x..5....x..0..x..5....x..5..x..1....x..4..x..5....x..5..x..2
..0..x..3..x....5..x..6..x....1..x..6..x....3..x..6..x....0..x..4..x
..x..4..x..6....x..7..x..5....x..0..x..4....x..2..x..0....x..1..x..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 10 2012
STATUS
approved