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A005032 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

G.f.: 7/(1-3*x). a(n) = 3*a(n-1), a(0)=7. - Vincenzo Librandi, Sep 15 2011

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 December 9 10:21 EST 2016. Contains 278971 sequences.