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%I #25 Dec 19 2022 16:24:52
%S 27,54,108,216,432,864,1728,3456,6912,13824,27648,55296,110592,221184,
%T 442368,884736,1769472,3538944,7077888,14155776,28311552,56623104,
%U 113246208,226492416,452984832,905969664,1811939328,3623878656,7247757312,14495514624,28991029248
%N a(n) = 27*2^n.
%C The squares of these terms appear in A159274.
%H Vincenzo Librandi, <a href="/A175806/b175806.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (2).
%F G.f.: 27/(1-2*x).
%t Table[27 2^n, {n, 0, 40}] (* _Vincenzo Librandi_, Sep 30 2013 *)
%t NestList[2#&,27,30] (* _Harvey P. Dale_, Apr 17 2022 *)
%o (Magma)[27*2^n: n in [0..40]];
%o (PARI) apply(n -> 27*2^n, [0..40]) \\ _Satish Bysany_, Mar 06 2017
%Y Cf. A000290, A159274.
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Dec 05 2010
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