OFFSET
1,3
COMMENTS
Column 4 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
...3.0.3....0.3.4....3.4.3....3.4.0....3.4.0....3.4.3....3.4.0....3.4.3
..4.2.5.0..3.1.5.6..5.0.2.5..5.0.5.2..2.0.2.5..2.5.2.5..0.5.3.4..0.2.5.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 25 2012
STATUS
approved