OFFSET
1,3
COMMENTS
Column 3 of A212036
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..1.2......1.2......1.2......0.1......1.2......1.2......1.2......1.2
..3.4.5....3.4.5....3.4.5....2.1.0....1.3.3....3.2.0....3.4.5....3.4.0
..2.0.6.7..6.7.7.2..6.0.5.4..3.4.5.6..4.0.5.6..4.5.3.6..6.0.2.7..2.5.6.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 27 2012
STATUS
approved