OFFSET
0,3
EXAMPLE
Some solutions for n=4
..0..1..2..3....0..1..2..3....3..1..0..2....2..1..1..2....1..3..0..2
..1..0..2..3....1..2..1..2....1..1..2..2....1..2..1..2....3..1..1..1
..2..2..2..0....2..1..2..1....0..2..2..2....1..1..2..2....0..1..2..3
..3..3..0..0....3..2..1..0....2..2..2..0....2..2..2..0....2..1..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 20 2012
EXTENSIONS
a(0)=1 prepended and terms a(9) and beyond from Andrew Howroyd, Apr 07 2020
STATUS
approved