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A175603
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a(n) = 8*(10^n-5).
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1
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40, 760, 7960, 79960, 799960, 7999960, 79999960, 799999960, 7999999960, 79999999960, 799999999960, 7999999999960, 79999999999960, 799999999999960, 7999999999999960, 79999999999999960, 799999999999999960
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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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G.f.: 40*x*(1+8*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011
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MATHEMATICA
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CoefficientList[Series[40 (1 + 8 x)/((10 x - 1) (x - 1)), {x, 0, 30}], x] (* Vincenzo Librandi, Oct 05 2014 *)
LinearRecurrence[{11, -10}, {40, 760}, 20] (* Harvey P. Dale, May 12 2022 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy,less
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AUTHOR
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STATUS
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approved
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