OFFSET
0,3
EXAMPLE
Some solutions for n=4
..0..2..2..0....2..2..0..0....2..1..0..1....1..1..0..2....1..2..0..1
..2..0..0..2....2..1..1..0....1..1..2..0....1..2..1..0....2..1..0..1
..2..0..1..1....0..1..1..2....0..2..1..1....0..1..1..2....0..0..2..2
..0..2..1..1....0..0..2..2....1..0..1..2....2..0..2..0....1..1..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 20 2012
EXTENSIONS
a(0)=1 prepended and terms a(10) and beyond from Andrew Howroyd, Apr 07 2020
STATUS
approved