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A116530
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a(n) = 3*a(n-1), with a(1) = 20.
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1
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20, 60, 180, 540, 1620, 4860, 14580, 43740, 131220, 393660, 1180980, 3542940, 10628820, 31886460, 95659380, 286978140, 860934420, 2582803260, 7748409780, 23245229340, 69735688020, 209207064060, 627621192180, 1882863576540
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n) = 20*3^(n-1).
E.g.f.: (20/3)*(exp(3*x) - 1). (End)
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,less,easy
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AUTHOR
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Ben Gregson (mahishimi(AT)hotmail.com), Mar 26 2006
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STATUS
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approved
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