A013896 a(n) = 20^(5*n + 3).
8000, 25600000000, 81920000000000000, 262144000000000000000000, 838860800000000000000000000000, 2684354560000000000000000000000000000, 8589934592000000000000000000000000000000000, 27487790694400000000000000000000000000000000000000
Offset: 0
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..50
- Tanya Khovanova, Recursive Sequences.
- Index entries for linear recurrences with constant coefficients, signature (3200000).
Programs
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Magma
[20^(5*n+3): n in [0..10]]; // Vincenzo Librandi, May 27 2011
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Mathematica
20^(5Range[0,20]+3) (* or *) NestList[3200000#&,8000,20] (* Harvey P. Dale, Dec 05 2021 *)
Formula
a(n) = 3200000*a(n-1), a(0)=8000. - Vincenzo Librandi, May 27 2011
From Elmo R. Oliveira, Jul 11 2025: (Start)
G.f.: 8000/(1-3200000*x).
E.g.f.: 8000*exp(3200000*x).