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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 STATUS approved

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Last modified August 23 00:16 EDT 2017. Contains 290953 sequences.