OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..12
EXAMPLE
Some solutions for n=4
..0..3..2..3....0..1..2..1....1..0..2..2....3..0..1..0....2..3..0..3
..3..1..0..1....1..3..0..1....0..1..3..1....0..2..1..3....3..2..1..1
..2..0..2..0....2..0..2..3....2..3..0..1....1..1..3..2....0..1..3..0
..3..1..0..1....1..1..3..0....2..1..1..2....0..3..2..0....3..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 31 2012
STATUS
approved