A013741 a(n) = 7^(3*n + 2).

49, 16807, 5764801, 1977326743, 678223072849, 232630513987207, 79792266297612001, 27368747340080916343, 9387480337647754305649, 3219905755813179726837607, 1104427674243920646305299201, 378818692265664781682717625943

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 (343).

Formula

From Philippe Deléham, Nov 28 2008: (Start)

a(n) = 343*a(n-1); a(0)=49.

G.f.: 49/(1-343*x). (End)

Maple

seq(7^(3*n+2), n=0..11); # Nathaniel Johnston, Jun 26 2011

Mathematica

7^(3Range[0, 20]+2) (* or *) NestList[343#&, 49, 20] (* Harvey P. Dale, Oct 03 2012 *)

Prog

(Magma) [7^(3*n+2): n in [0..15]]; // Vincenzo Librandi, May 25 2011
(PARI) a(n)=7^(3*n+2) \\ Charles R Greathouse IV, Jul 11 2016

Crossrefs

Cf. A013740.

Sequence in context: A381163 A202991 A203061 * A178190 A319941 A210819

Adjacent sequences: A013738 A013739 A013740 * A013742 A013743 A013744

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved