OFFSET
1,1
COMMENTS
Column 4 of A187408
EXAMPLE
Some solutions for 4X4
..0..0..1..2....0..0..3..0....0..0..2..2....0..0..4..0....0..1..1..1
..3..0..4..2....0..0..2..1....0..0..2..0....4..0..3..1....2..0..4..4
..0..2..0..0....4..1..0..0....2..2..0..2....0..3..0..1....3..1..0..0
..4..3..1..0....0..1..1..0....2..0..2..0....3..2..0..0....2..4..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 09 2011
STATUS
approved