OFFSET
1,3
COMMENTS
Row 7 of A270606.
EXAMPLE
Some solutions for n=3
........0..............3..............3..............0..............0
.......3.3............1.0............3.0............3.3............0.0
......0.0.3..........0.0.0..........0.0.0..........0.0.3..........0.3.0
.....0.0.3.0........0.0.1.0........0.0.0.0........0.0.3.3........0.0.3.2
....0.0.0.3.3......0.0.0.0.0......0.0.0.3.3......0.0.0.0.2......0.0.0.3.3
...0.0.0.0.3.3....0.0.0.0.3.0....0.0.0.0.3.0....0.0.0.0.3.3....0.0.0.0.3.3
..0.0.0.0.0.0.2..0.0.0.0.0.3.0..0.0.0.0.1.0.0..0.0.0.0.0.3.2..0.0.0.0.3.3.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 20 2016
STATUS
approved