OFFSET
1,2
COMMENTS
Column 4 of A216792
EXAMPLE
Some solutions for n=3
......0.1.2..........0.1.2..........0.1.2..........0.1.0..........0.1.0
.....1.2.3.1........2.3.0.1........3.2.0.1........1.2.3.1........1.2.3.1
....0.3.0.2.0......3.0.2.3.0......2.1.3.2.0......2.3.0.2.3......2.3.0.2.3
.....1.2.1.3........1.3.0.1........3.0.1.3........1.2.3.0........1.2.3.1
......0.3.2..........2.1.2..........1.2.0..........3.1.2..........3.0.2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 16 2012
STATUS
approved