OFFSET
1,3
COMMENTS
Column 3 of A211916
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
..0.3.4....3.4.5....3.0.4....3.4.0....3.4.5....0.3.4....0.3.4....3.4.5
..5.6.0.5..0.1.6.7..4.5.6.0..5.6.7.6..2.1.6.3..5.2.6.7..4.5.6.1..1.6.2.1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 25 2012
STATUS
approved