A013812 a(n) = 20^(4*n + 1).
20, 3200000, 512000000000, 81920000000000000, 13107200000000000000000, 2097152000000000000000000000, 335544320000000000000000000000000, 53687091200000000000000000000000000000, 8589934592000000000000000000000000000000000, 1374389534720000000000000000000000000000000000000
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+1): n in [0..15]]; // Vincenzo Librandi, Jul 06 2011
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Maple
A013812:=n->20^(4*n+1): seq(A013812(n), n=0..10); # Wesley Ivan Hurt, Mar 31 2017
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Mathematica
20^(4*Range[0,10]+1) (* or *) NestList[160000#&,20,10] (* Harvey P. Dale, Dec 30 2012 *)
Formula
a(n) = 160000*a(n-1). - Harvey P. Dale, Dec 30 2012
From Elmo R. Oliveira, Jul 13 2025: (Start)
G.f.: 20/(1-160000*x).
E.g.f.: 20*exp(160000*x).