OFFSET
1,4
COMMENTS
Row 3 of A215788
EXAMPLE
Some solutions for n=5
..0..x..1..x..2....0..x..1..x..3....0..x..1..x..3....0..x..1..x..2
..x..3..x..5..x....x..2..x..5..x....x..2..x..4..x....x..3..x..4..x
..4..x..6..x..7....4..x..6..x..7....5..x..6..x..7....5..x..6..x..7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 23 2012
STATUS
approved