OFFSET
1,2
COMMENTS
Diagonal of A239537
EXAMPLE
Some solutions for n=4
..0..1..2..1..0....0..1..0..2..0....0..1..0..0..1....0..1..1..0..2
..0..1..2..1..0....0..1..0..2..0....0..1..0..0..1....0..1..1..0..2
..0..2..0..0..1....0..1..2..2..1....2..0..2..2..0....1..0..2..0..1
..1..2..0..0..1....0..2..2..0..1....2..0..2..2..0....1..0..2..2..1
..1..2..0..0..1....0..2..2..0..1....2..0..2..2..0....1..0..2..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 21 2014
STATUS
approved