OFFSET
1,3
COMMENTS
Column 3 of A211904
EXAMPLE
Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2
...3.4.5....2.3.0....3.4.5....3.4.5....3.4.5....3.4.1....3.4.0....3.4.1
..5.6.0.3..4.0.5.6..0.2.6.0..6.2.7.2..6.1.3.1..0.1.5.6..1.5.3.6..5.2.5.6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 25 2012
STATUS
approved