OFFSET
1,3
COMMENTS
Diagonal of A265991.
EXAMPLE
Some solutions for n=6
..1..2..2..1..1..2....1..2..2..1..1..2....1..2..2..1..1..2....0..0..0..0..0..0
..1..1..1..1..4..2....1..1..1..1..4..1....1..1..1..1..4..2....0..0..0..0..0..0
..1..4..1..1..1..1....1..4..1..1..1..2....1..4..1..1..1..1....0..0..0..0..0..0
..2..1..1..1..4..1....2..1..1..1..4..1....1..1..1..1..4..1....0..0..0..0..0..0
..1..4..1..1..1..1....1..4..1..1..1..1....2..4..1..1..1..1....0..0..0..0..0..0
..2..1..1..2..2..1....2..1..1..2..2..1....2..1..1..2..2..1....0..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2015
STATUS
approved