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A175603
a(n) = 8*(10^n-5).
1
40, 760, 7960, 79960, 799960, 7999960, 79999960, 799999960, 7999999960, 79999999960, 799999999960, 7999999999960, 79999999999960, 799999999999960, 7999999999999960, 79999999999999960, 799999999999999960
OFFSET
1,1
FORMULA
G.f.: 40*x*(1+8*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011
MATHEMATICA
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 *)
PROG
(Magma) [8*(10^n-5): n in [1..30]]; // Vincenzo Librandi, Oct 05 2014
CROSSREFS
Equals 40 * A067272.
Sequence in context: A160445 A010840 A233725 * A319308 A022073 A261571
KEYWORD
nonn,easy,less
AUTHOR
Vincenzo Librandi Nov 15 2010
STATUS
approved