OFFSET
1,2
COMMENTS
Diagonal of A268367.
EXAMPLE
Some solutions for n=3
..1..2..0....0..2..1....0..2..1....0..2..1....1..0..2....2..0..1....1..0..2
..1..0..2....1..2..0....0..2..1....1..0..2....1..2..0....2..0..1....0..2..1
..1..2..0....2..1..0....1..2..0....1..2..0....1..2..0....0..2..1....0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 03 2016
STATUS
approved