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A034730 Dirichlet convolution of b_n=1 with c_n=3^(n-1). 1
1, 4, 10, 31, 82, 256, 730, 2218, 6571, 19768, 59050, 177430, 531442, 1595056, 4783060, 14351125, 43046722, 129146980, 387420490, 1162281262, 3486785140, 10460412256, 31381059610, 94143358444, 282429536563, 847289140888 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

FORMULA

G.f.: Sum_{n>0} x^n/(1-3*x^n). - Vladeta Jovovic, Nov 14 2002

a(n) ~ 3^(n-2). - Vaclav Kotesovec, Sep 09 2014

MATHEMATICA

Rest[CoefficientList[Series[Sum[x^k/(1-3*x^k), {k, 1, 30}], {x, 0, 30}], x]] (* Vaclav Kotesovec, Sep 09 2014 *)

CROSSREFS

Cf. A034729.

Sequence in context: A145453 A264564 A304963 * A321143 A095127 A006342

Adjacent sequences:  A034727 A034728 A034729 * A034731 A034732 A034733

KEYWORD

nonn

AUTHOR

Erich Friedman

STATUS

approved

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Last modified April 23 07:51 EDT 2019. Contains 322381 sequences. (Running on oeis4.)