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A175806 a(n) = 27*2^n. 8
27, 54, 108, 216, 432, 864, 1728, 3456, 6912, 13824, 27648, 55296, 110592, 221184, 442368, 884736, 1769472, 3538944, 7077888, 14155776, 28311552, 56623104, 113246208, 226492416, 452984832, 905969664, 1811939328, 3623878656, 7247757312, 14495514624, 28991029248 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

The squares of these terms appear in A159274.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (2).

FORMULA

G.f.: 27/(1-2*x).

MATHEMATICA

Table[27 2^n, {n, 0, 40}] (* Vincenzo Librandi, Sep 30 2013 *)

NestList[2#&, 27, 30] (* Harvey P. Dale, Apr 17 2022 *)

PROG

(Magma)[27*2^n: n in [0..40]];

(PARI) apply(n -> 27*2^n, [0..40]) \\ Satish Bysany, Mar 06 2017

CROSSREFS

Cf. A000290, A159274.

Sequence in context: A306824 A043323 A033903 * A232922 A306761 A181874

Adjacent sequences: A175803 A175804 A175805 * A175807 A175808 A175809

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Dec 05 2010

STATUS

approved

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Last modified February 3 21:17 EST 2023. Contains 360045 sequences. (Running on oeis4.)