OFFSET
1,1
COMMENTS
Column 4 of A206206
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 10*a(n-3) +a(n-9) for n>18
EXAMPLE
Some solutions for n=4
..0..1..1..2..2....1..0..0..0..0....3..0..0..3..2....2..3..3..2..2
..0..1..1..1..2....0..0..0..2..2....3..0..0..0..1....2..3..3..3..1
..0..0..1..1..1....0..0..2..2..2....3..3..0..0..0....2..2..3..3..3
..0..0..0..1..1....0..2..2..2..1....3..3..3..0..0....2..2..2..3..3
..1..0..0..0..0....1..2..2..0..1....1..3..3..3..3....1..2..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 04 2012
STATUS
approved