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A054616 a(n) = Sum_{d|n} phi(d)*9^(n/d). 2
0, 9, 90, 747, 6660, 59085, 532350, 4783023, 43053480, 387422001, 3486843810, 31381059699, 282430082700, 2541865828437, 22876797238470, 205891132215735, 1853020231912080, 16677181699666713, 150094635685484490, 1350851717672992251 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..1000

PROG

(PARI) a(n) = if(n==0, 0, sumdiv(n, d, eulerphi(d)*9^(n/d))); \\ Altug Alkan, Mar 16 2018

CROSSREFS

Column k=9 of A185651.

Sequence in context: A210088 A261315 A270242 * A052386 A246941 A186510

Adjacent sequences:  A054613 A054614 A054615 * A054617 A054618 A054619

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 16 2000

STATUS

approved

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Last modified September 16 08:36 EDT 2019. Contains 327091 sequences. (Running on oeis4.)