A013815 a(n) = 21^(4*n + 3).

9261, 1801088541, 350277500542221, 68122318582951682301, 13248496640331026125580781, 2576580875108218291929075869661, 501096025171921401632658604207540941, 97453656071460446110921078004886769746621, 18952884486433699020098042171468383867092598701

Offset

0,1

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 (194481).

Mathematica

NestList[194481#&, 9261, 10] (* Harvey P. Dale, May 11 2018 *)

Prog

(Magma) [21^(4*n+3): n in [0..15]]; // Vincenzo Librandi, Jul 07 2011

Crossrefs

Sequence in context: A184211 A035910 A202466 * A013900 A100696 A225024

Adjacent sequences: A013812 A013813 A013814 * A013816 A013817 A013818

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved