A013781 a(n) = 4^(4*n + 3).

64, 16384, 4194304, 1073741824, 274877906944, 70368744177664, 18014398509481984, 4611686018427387904, 1180591620717411303424, 302231454903657293676544, 77371252455336267181195264, 19807040628566084398385987584, 5070602400912917605986812821504, 1298074214633706907132624082305024

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 (256).

Formula

From Philippe Deléham, Nov 27 2008: (Start)

a(n) = 256*a(n-1); a(0)=64.

G.f.: 64/(1-256*x).

a(n) = 4*A013721(n). (End)

E.g.f.: 64*exp(256*x). - Stefano Spezia, Jun 06 2026

Mathematica

4^(4*Range[0, 15] + 3) (* Paolo Xausa, May 29 2026 *)

Prog

(Magma) [4^(4*n+3): n in [0..15]]; // Vincenzo Librandi, Jun 04 2011
(Maxima) makelist(4^(4*n+3), n, 0, 20); /* Martin Ettl, Oct 21 2012 */
(PARI) a(n) = 4^(4*n+3); \\ Altug Alkan, Sep 08 2018

Crossrefs

Cf. A013721.

Sequence in context: A123051 A064068 A220853 * A330482 A187407 A393878

Adjacent sequences: A013778 A013779 A013780 * A013782 A013783 A013784

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved