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