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A083583 a(n) = (8*3^n - 5*0^n)/3. 2
1, 8, 24, 72, 216, 648, 1944, 5832, 17496, 52488, 157464, 472392, 1417176, 4251528, 12754584, 38263752, 114791256, 344373768, 1033121304, 3099363912, 9298091736, 27894275208, 83682825624, 251048476872, 753145430616, 2259436291848 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..300

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

FORMULA

a(n) = (8*3^n - 5*0^n)/3.

G.f.: (1+5*x)/(1-3*x).

E.g.f.: (8*exp(3x) - 5*exp(0))/3.

a(n) = A005051(n-1), n > 0. - R. J. Mathar, Sep 17 2008

MATHEMATICA

Join[{1}, NestList[3#&, 8, 30]] (* Harvey P. Dale, Apr 08 2020 *)

PROG

(MAGMA) [(8*3^n-5*(0)^n)/3: n in [0..30]]; // Vincenzo Librandi, Jun 10 2011

CROSSREFS

Cf. A083854.

Sequence in context: A090336 A200253 A199911 * A005051 A303402 A078158

Adjacent sequences:  A083580 A083581 A083582 * A083584 A083585 A083586

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 01 2003

STATUS

approved

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Last modified December 4 15:36 EST 2020. Contains 338928 sequences. (Running on oeis4.)