OFFSET
1,3
COMMENTS
Column 4 of A212026
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
..0.3.4....3.4.3....3.4.1....0.2.3....3.2.0....3.4.0....3.4.5....0.3.4
..1.5.0.1..5.6.3.6..3.0.1.5..4.5.3.5..3.4.3.5..2.5.2.1..2.6.7.2..5.6.7.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 26 2012
STATUS
approved