OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) - a(n-2) + 3*a(n-3) + 3*a(n-4) - a(n-5) - a(n-6) for n>8.
Empirical g.f.: 2*x*(4961 + 95029*x + 34482*x^2 - 172885*x^3 - 266116*x^4 - 117704*x^5 + 41864*x^6 + 39568*x^7) / ((1 - x + 2*x^2 - x^3)*(1 - 2*x - 3*x^2 - x^3)). - Colin Barker, Dec 02 2018
EXAMPLE
Some solutions for n=1:
..1..0..2..0..1..1..2..0..1....1..0..2..0..2..0..1..1..1
..0..2..0..2..0..2..0..2..2....0..2..0..2..0..2..0..2..1
..2..0..2..0..1..1..2..0..1....1..1..2..0..2..0..2..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 2014
STATUS
approved