OFFSET
1,1
COMMENTS
Column 4 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>17
EXAMPLE
Some solutions for n=4
..3..3..1..3..2..1....1..2..3..1..2..0....3..3..0..3..0..0....2..1..0..2..1..3
..0..1..2..0..1..2....2..1..0..2..1..0....2..1..0..2..1..3....2..2..3..1..2..0
..0..3..0..0..3..0....0..3..0..3..3..0....1..2..0..1..2..0....3..3..0..0..3..0
..3..2..1..3..2..1....1..2..0..1..2..0....0..3..0..3..3..0....2..1..0..2..1..0
..0..1..2..0..1..0....2..1..0..2..1..3....2..1..0..2..1..0....1..2..0..1..2..3
..0..3..0..0..3..0....3..3..0..3..0..3....1..2..3..1..2..0....0..3..0..3..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2014
STATUS
approved