OFFSET
1,1
COMMENTS
Column 3 of A206238.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 129*a(n-3) - 129*a(n-4) for n>7.
Empirical g.f.: 2*x*(155 + 413*x + 1660*x^2 - 8639*x^3 - 165*x^4 + 22668*x^5 - 16860*x^6) / ((1 - x)*(1 - 129*x^3)). - Colin Barker, Jun 14 2018
EXAMPLE
Some solutions for n=4:
..0..1..2..0....0..0..1..0....0..0..1..0....0..0..1..1....0..0..1..0
..3..2..2..0....0..1..0..0....2..0..0..2....1..1..0..1....2..0..0..1
..2..2..1..2....1..0..0..1....3..1..0..0....2..1..1..0....3..1..0..0
..2..1..2..2....0..0..2..3....3..3..1..0....1..2..1..1....3..3..1..0
..3..2..2..3....1..1..3..3....1..3..3..1....1..1..0..0....0..3..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 05 2012
STATUS
approved