OFFSET
1,1
COMMENTS
Column 7 of A215959
EXAMPLE
Some solutions for n=4
..0..x..1..x..2..x..3....0..x..1..x..2..x..3....0..x..1..x..2..x..3
..x..1..x..3..x..1..x....x..1..x..4..x..0..x....x..1..x..4..x..5..x
..1..x..3..x..1..x..4....1..x..3..x..5..x..6....1..x..3..x..0..x..1
..x..4..x..2..x..4..x....x..2..x..7..x..2..x....x..3..x..0..x..2..x
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 28 2012
STATUS
approved