OFFSET
1,1
COMMENTS
Column 7 of A215904
EXAMPLE
Some solutions for n=3
..0..x..1..x..2..x..3....0..x..1..x..2..x..3....0..x..0..x..1..x..2
..x..4..x..4..x..5..x....x..4..x..5..x..4..x....x..3..x..4..x..5..x
..6..x..6..x..0..x..1....0..x..0..x..0..x..3....6..x..1..x..0..x..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 26 2012
STATUS
approved