OFFSET
1,2
COMMENTS
Diagonal of A239155
EXAMPLE
Some solutions for n=4
..0..1..0..2..1....0..1..1..2..3....0..1..2..3..2....0..1..2..0..3
..0..1..0..2..1....0..1..1..2..3....0..1..2..3..2....0..1..2..0..3
..3..1..3..2..3....0..2..1..2..3....0..1..3..3..2....0..1..0..1..0
..3..1..3..2..3....3..2..2..3..2....0..2..3..0..2....0..2..0..1..0
..3..1..3..2..3....3..2..2..3..2....0..2..3..0..2....0..2..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 2014
STATUS
approved