OFFSET
1,1
COMMENTS
Column 2 of A252192.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-3) -14*a(n-6) +8*a(n-9) for n>16.
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..1..2..0....1..2..3..1....2..0..1..2....3..3..1..3
..0..2..1..0....3..2..1..0....2..1..0..0....0..0..3..3....1..2..3..2
..3..1..2..3....0..3..3..0....0..3..0..0....1..3..2..1....2..2..3..2
..0..0..3..0....0..1..2..0....1..2..3..1....2..3..1..2....3..3..1..3
..3..2..1..0....0..2..1..0....2..1..0..2....3..0..0..0....2..2..3..1
..0..1..2..3....0..3..0..3....0..3..0..0....1..0..2..1....2..2..3..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2014
STATUS
approved