OFFSET
1,2
COMMENTS
Row 4 of A221623
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..13
EXAMPLE
Some solutions for n=3
..2..3..1....1..3..2....1..2..3....2..3..1....2..1..3....1..2..3....2..3..1
..2..3..1....2..1..3....1..2..3....1..3..2....3..1..2....1..2..3....2..3..1
..2..3..1....2..3..1....3..1..2....2..1..3....3..1..2....1..3..2....3..1..2
..1..3..2....2..3..1....2..1..3....3..1..2....2..3..1....2..1..3....1..3..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 21 2013
STATUS
approved