OFFSET
1,1
COMMENTS
Column 4 of A252811.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-3) -4*a(n-6) -2*a(n-9) +a(n-12) for n>15.
EXAMPLE
Some solutions for n=2
..0..1..2..0..3..4....0..1..2..0..3..2....0..1..2..3..1..2....0..1..2..3..1..2
..0..2..1..0..4..1....4..0..2..3..0..2....1..0..2..1..3..2....2..2..2..2..2..2
..0..0..0..0..0..0....2..2..2..2..2..2....2..2..2..2..2..2....1..3..2..1..4..2
..0..1..4..0..1..3....1..3..2..0..1..2....3..1..2..0..4..2....3..0..2..4..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 22 2014
STATUS
approved