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A005032 a(n) = 7*3^n. 10
7, 21, 63, 189, 567, 1701, 5103, 15309, 45927, 137781, 413343, 1240029, 3720087, 11160261, 33480783, 100442349, 301327047, 903981141, 2711943423, 8135830269, 24407490807, 73222472421, 219667417263, 659002251789, 1977006755367, 5931020266101, 17793060798303 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (3).

FORMULA

From Vincenzo Librandi, Sep 15 2011: (Start)

G.f.: 7/(1-3*x).

a(n) = 3*a(n-1), a(0)=7. (End)

MAPLE

with(finance):seq(futurevalue(7, 2, n), n=0..22); # Zerinvary Lajos, Mar 25 2009

MATHEMATICA

7*3^Range[0, 60] (* Vladimir Joseph Stephan Orlovsky, Jun 09 2011 *)

NestList[3#&, 7, 30] (* Harvey P. Dale, May 05 2016 *)

PROG

(MAGMA) [7*3^n: n in [0..30]]; // Vincenzo Librandi, Sep 15 2011

(PARI) a(n)=7*3^n \\ Charles R Greathouse IV, Oct 07 2015

CROSSREFS

Sequence in context: A146139 A083596 A082541 * A152766 A152671 A113859

Adjacent sequences:  A005029 A005030 A005031 * A005033 A005034 A005035

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified April 29 09:07 EDT 2017. Contains 285604 sequences.