OFFSET
1,2
FORMULA
G.f.: Sum_{k>=1} 3^(k-1) * x^k/(1 - x^k - x^(2*k)). - Ilya Gutkovskiy, Jul 24 2019
a(n) ~ 3^(n-1). - Vaclav Kotesovec, Sep 11 2019
MATHEMATICA
Table[Sum[Fibonacci[n/d]*3^(d - 1), {d, Divisors[n]}], {n, 1, 25}] (* Vaclav Kotesovec, Sep 10 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved