OFFSET
1,2
COMMENTS
Column 5 of A216031
EXAMPLE
Some solutions for n=4
..x..0..x..1..x....x..0..x..1..x....x..0..x..1..x....x..0..x..1..x
..1..x..2..x..3....0..x..2..x..3....2..x..3..x..4....0..x..2..x..0
..x..4..x..0..x....x..4..x..0..x....x..5..x..4..x....x..2..x..0..x
..4..x..1..x..2....4..x..5..x..1....0..x..4..x..0....3..x..4..x..5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 30 2012
STATUS
approved