OFFSET
1,1
COMMENTS
Diagonal of A203878
EXAMPLE
Some solutions for n=4
..0..0..0..0..0....0..0..0..0..0....0..1..0..0..0....0..0..0..0..1
..1..2..1..1..2....1..1..1..1..1....2..3..2..1..2....1..1..1..2..3
..3..0..0..3..3....0..2..0..2..0....0..3..2..3..0....2..2..3..0..3
..3..1..1..1..0....1..1..3..1..1....0..1..0..3..0....3..0..1..2..3
..0..0..0..2..2....2..2..3..2..2....2..3..2..3..0....2..0..1..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 07 2012
STATUS
approved