OFFSET
1,3
COMMENTS
Column 5 of A212036
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..1.1......1.2......1.2......1.2......0.1......1.1......1.2......1.2
..2.2.3....3.2.4....3.3.1....1.3.4....2.1.0....2.3.3....3.2.4....3.3.4
..4.4.1.0..5.6.0.1..0.0.4.3..4.5.6.2..2.3.3.4..0.0.4.5..4.5.5.6..4.0.1.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 27 2012
STATUS
approved