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A177097
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a(n) = 6*(10^n-5).
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0
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30, 570, 5970, 59970, 599970, 5999970, 59999970, 599999970, 5999999970, 59999999970, 599999999970, 5999999999970, 59999999999970, 599999999999970, 5999999999999970, 59999999999999970, 599999999999999970
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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G.f.: 30*x*(1+8*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011
a(1)=30, a(2)=570, a(n)=11*a(n-1)-10*a(n-2). [Harvey P. Dale, Oct 10 2011]
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MATHEMATICA
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Join[{30, 570}, FromDigits/@(Join[{5}, #, {7, 0}]&/@Table[PadLeft[{}, n, 9], {n, 20}])] (* or *) LinearRecurrence[{11, -10}, {30, 570}, 20] (* Harvey P. Dale, Oct 10 2011 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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