OFFSET
1,1
COMMENTS
Column 7 of A216612
EXAMPLE
Some solutions for n=4
..x..0..x..1..x..2..x....x..0..x..1..x..2..x....x..0..x..1..x..2..x
..1..x..2..x..3..x..4....1..x..2..x..3..x..1....1..x..2..x..3..x..4
..x..4..x..5..x..2..x....x..0..x..4..x..2..x....x..5..x..6..x..5..x
..0..x..6..x..4..x..3....5..x..2..x..5..x..0....0..x..2..x..1..x..7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 10 2012
STATUS
approved