A175806 a(n) = 27*2^n.

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

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).

From Elmo R. Oliveira, Sep 14 2024: (Start)

E.g.f.: 27*exp(2*x).

a(n) = 27*A000079(n).

a(n) = 2*a(n-1) for n > 0. (End)

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. A000079, 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