OFFSET
1,2
COMMENTS
Column 5 of A217510
EXAMPLE
Some solutions for n=4
.....0........0........3........0........0........0........3........3
....1.0......2.1......0.0......1.3......2.0......0.5......0.2......1.0
...0.3.1....1.3.2....3.1.2....1.0.2....0.5.1....2.1.0....0.2.1....1.0.0
..2.0.3.0..0.1.0.0..1.0.0.0..1.0.2.0..2.0.0.0..0.0.2.0..2.0.0.0..1.1.1.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 05 2012
STATUS
approved