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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
OFFSET
0,1
COMMENTS
The squares of these terms appear in A159274.
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
Sequence in context: A306824 A043323 A033903 * A232922 A306761 A181874
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Dec 05 2010
STATUS
approved