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A033137
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Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,1,0.
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6
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1, 11, 110, 1101, 11011, 110110, 1101101, 11011011, 110110110, 1101101101, 11011011011, 110110110110, 1101101101101, 11011011011011, 110110110110110, 1101101101101101
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OFFSET
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1,2
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LINKS
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FORMULA
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G.f.: x*(1+x) / ( (x-1)*(10*x-1)*(1+x+x^2) ). - R. J. Mathar, Jan 08 2011
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MATHEMATICA
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Table[FromDigits[PadRight[{}, n, {1, 1, 0}]], {n, 20}] (* Harvey P. Dale, Aug 13 2014 *)
CoefficientList[Series[(1 + x)/((x - 1) (10 x - 1) (1 + x + x^2)), {x, 0, 20}], x] (* Vincenzo Librandi, Aug 14 2014 *)
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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