A013896 a(n) = 20^(5*n + 3).

8000, 25600000000, 81920000000000000, 262144000000000000000000, 838860800000000000000000000000, 2684354560000000000000000000000000000, 8589934592000000000000000000000000000000000, 27487790694400000000000000000000000000000000000000

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

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).

Crossrefs

Subsequence of A009964.

Cf. A013824, A013856, A016885.

Programs

Magma

[20^(5*n+3): n in [0..10]]; // Vincenzo Librandi, May 27 2011

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).

a(n) = A013824(n)*A013856(n) = A009964(A016885(n)). (End)