A013886 a(n) = 18^(5*n + 1).

18, 34012224, 64268410079232, 121439531096594251776, 229468251895129407139872768, 433595865796975883590475106484224, 819308872942260126404286866009182175232, 1548139828427760582529495524831238344488779776, 2925315479322586708409093799864313376118974623776768

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

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 (1889568).

Crossrefs

Cf. A001027.

Programs

Magma

[18^(5*n+1): n in [0..10]]; // Vincenzo Librandi, May 27 2011

Mathematica

18^(5*Range[0,20]+1) (* or *) NestList[1889568#&,18,10] (* Harvey P. Dale, Oct 29 2016 *)

PARI

a(n) = 18^(5*n+1); \\ Seiichi Manyama, Aug 15 2023

Formula

a(n) = 1889568*a(n-1), a(0)=18. - Vincenzo Librandi, May 27 2011