OFFSET
1,2
COMMENTS
Column 4 of A267617.
EXAMPLE
Some solutions for n=4
..0..0..2..2....0..0..2..2....0..0..3..3....0..0..3..3....0..0..3..3
..0..0..1..1....3..3..3..2....2..2..3..3....1..1..1..2....3..3..1..1
..3..3..3..3....3..0..2..1....1..1..1..1....1..0..2..2....2..2..1..1
..1..1..2..2....0..1..1..1....0..0..2..2....0..2..3..3....0..0..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2016
STATUS
approved