OFFSET
1,3
COMMENTS
Row 6 of A270606.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..14
EXAMPLE
Some solutions for n=3
.......0............0............0............0............0............0
......0.0..........0.0..........0.0..........0.0..........0.0..........0.0
.....0.1.0........0.3.0........3.0.3........3.0.0........0.1.0........3.0.0
....0.0.0.0......3.0.1.0......0.3.3.0......0.3.0.0......0.0.3.0......0.3.3.0
...0.0.0.0.1....0.0.0.0.0....0.0.3.3.3....0.0.0.0.3....0.0.3.0.0....0.0.0.3.3
..0.0.0.3.0.3..0.0.1.0.0.0..0.0.0.0.0.1..0.0.0.0.1.0..0.0.3.3.0.0..0.0.1.0.0.1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 20 2016
STATUS
approved