A013756 a(n) = 15^(3*n + 1).

15, 50625, 170859375, 576650390625, 1946195068359375, 6568408355712890625, 22168378200531005859375, 74818276426792144775390625, 252511682940423488616943359375, 852226929923929274082183837890625, 2876265888493261300027370452880859375

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (3375).

Formula

From Philippe Deléham, Dec 03 2008: (Start)

a(n) = 3375*a(n-1); a(0)=15

G.f.: 15/(1-3375*x). (End)

Mathematica

Table[15^(3n+1), {n, 0, 10}] (* or *) NestList[3375#&, 15, 10] (* Harvey P. Dale, Sep 06 2023 *)

Prog

(Magma) [15^(3*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 27 2011
(PARI) a(n)=15^(3*n+1) \\ Charles R Greathouse IV, Jul 10 2016

Crossrefs

Subsequence of A001024.

Sequence in context: A104682 A185902 A358676 * A078185 A096224 A129613

Adjacent sequences: A013753 A013754 A013755 * A013757 A013758 A013759

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved