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1, 101, 10101, 1011101, 101111101, 10111111101, 1011111111101, 101111111111101, 10111111111111101, 1011111111111111101, 101111111111111111101, 10111111111111111111101
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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+10*x)*(100*x^2-10*x+1)/( (100*x-1)*(x-1)) .- R. J. Mathar, Aug 24 2011
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EXAMPLE
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n ...... a(n)
1 ....... 1
2 ...... 101
3 ..... 10101
4 .... 1011101
5 ... 101111101
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MATHEMATICA
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Rest[CoefficientList[Series[x(1+10x)(100x^2-10x+1)/((100x-1)(x-1)), {x, 0, 20}], x]] (* or *) Join[{1, 101}, Table[FromDigits[Join[{1, 0}, PadRight[ {}, 2n+1, 1], {0, 1}]], {n, 0, 20}]] (* Harvey P. Dale, Dec 26 2014 *)
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CROSSREFS
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KEYWORD
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easy,nonn,base
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AUTHOR
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STATUS
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approved
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