A013813 a(n) = 20^(4*n + 3).
8000, 1280000000, 204800000000000, 32768000000000000000, 5242880000000000000000000, 838860800000000000000000000000, 134217728000000000000000000000000000, 21474836480000000000000000000000000000000, 3435973836800000000000000000000000000000000000
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 (160000).
Programs
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Magma
[20^(4*n+3): n in [0..15]]; // Vincenzo Librandi, Jul 06 2011
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Mathematica
20^(4*Range[0, 10] + 3) (* or *) NestList[160000*# &, 8000, 10] (* Paolo Xausa, Jul 21 2025 *)
Formula
From Elmo R. Oliveira, Jul 13 2025: (Start)
G.f.: 8000/(1-160000*x).
E.g.f.: 8000*exp(160000*x).
a(n) = 160000*a(n-1).