OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..15
EXAMPLE
Some solutions for n=4
..0..0..1..1....0..1..2..1....0..0..2..1....0..0..1..0....0..1..1..0
..0..0..2..2....1..1..2..1....0..1..3..3....0..1..2..2....1..0..0..1
..1..2..3..1....2..2..0..3....2..3..2..0....1..2..2..0....1..0..0..1
..1..2..1..0....1..1..3..3....1..3..0..0....0..2..0..2....0..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 29 2012
STATUS
approved