A013721 a(n) = 16^(2*n + 1).
16, 4096, 1048576, 268435456, 68719476736, 17592186044416, 4503599627370496, 1152921504606846976, 295147905179352825856, 75557863725914323419136, 19342813113834066795298816, 4951760157141521099596496896
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..100
- Tanya Khovanova, Recursive Sequences
- Index entries for linear recurrences with constant coefficients, signature (256).
Programs
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Magma
[16^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 04 2011
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Mathematica
NestList[256#&,16,20] (* Harvey P. Dale, Oct 28 2015 *)
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PARI
a(n)=16^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016
Formula
From Philippe Deléham, Nov 27 2008: (Start)
a(n) = 256*a(n-1); a(0)=16.
G.f.: 16/(1-256*x).
a(n) = 4*A013780(n). (End)