OFFSET
1,1
COMMENTS
Row 3 of A215182.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) - 3*a(n-4) + 3*a(n-6) - 2*a(n-9) + a(n-10).
Empirical g.f.: x*(2 + x + 2*x^2 - 2*x^3 + 3*x^5 - 2*x^8 + x^9) / ((1 - x)^5*(1 + x)*(1 + x + x^2)^2). - Colin Barker, Jul 22 2018
EXAMPLE
Some solutions for n=4:
....1......3......2......2......1......1......3......0......2......3......4
...1.1....3.3....1.3....2.2....0.2....0.2....3.3....0.0....1.3....3.3....4.4
..1.1.1..3.3.3..0.3.3..2.2.2..0.1.2..0.0.3..1.4.4..0.0.0..1.1.4..2.3.4..4.4.4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 05 2012
STATUS
approved