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A034733
Dirichlet convolution of b_n=2^(n-1) with itself.
1
1, 4, 8, 20, 32, 80, 128, 288, 528, 1088, 2048, 4288, 8192, 16640, 32896, 66112, 131072, 263424, 524288, 1050880, 2097664, 4198400, 8388608, 16786944, 33554688, 67125248, 134219776, 268469248, 536870912, 1073812480, 2147483648
OFFSET
1,2
FORMULA
G.f.: Sum_{k>0} 2^(k-1)*x^k/(1-2*x^k). - Vladeta Jovovic, Jun 24 2003
a(n) ~ 2^n. - Vaclav Kotesovec, Sep 11 2019
MATHEMATICA
Table[Sum[2^(d + n/d - 2), {d, Divisors[n]}], {n, 1, 30}] (* Vaclav Kotesovec, Sep 11 2019 *)
CROSSREFS
Sequence in context: A180794 A047185 A349546 * A365964 A152233 A301896
KEYWORD
nonn
STATUS
approved