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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; internal format)
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OFFSET
| 0,1
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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 to sequences with linear recurrences with constant coefficients, signature (3).
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FORMULA
| G.f.: 7/(1-3*x). a(n) = 3*a(n-1), a(0)=7. - Vincenzo Librandi, Sep 15 2011
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MAPLE
| with(finance):seq(futurevalue(7, 2, n), n=0..22); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 25 2009]
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MATHEMATICA
| 7*3^Range[0, 60] (* From Vladimir Joseph Stephan Orlovsky, June 09 2011 *)
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PROG
| (MAGMA) [7*3^n: n in [0..30]]; // Vincenzo Librandi, Sep 15 2011
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CROSSREFS
| Sequence in context: A146139 A083596 A082541 * A152766 A152671 A113859
Adjacent sequences: A005029 A005030 A005031 * A005033 A005034 A005035
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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