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A168278
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(10*n + 5*(-1)^n + 3)/4.
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3
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2, 7, 7, 12, 12, 17, 17, 22, 22, 27, 27, 32, 32, 37, 37, 42, 42, 47, 47, 52, 52, 57, 57, 62, 62, 67, 67, 72, 72, 77, 77, 82, 82, 87, 87, 92, 92, 97, 97, 102, 102, 107, 107, 112, 112, 117, 117, 122, 122, 127, 127, 132, 132, 137, 137, 142, 142, 147, 147, 152, 152, 157
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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.: x*(2 + 5*x - 2*x^2)/( (1+x)*(x-1)^2 ). - R. J. Mathar, Jan 05 2011
E.g.f.: (1/4)*(5 - 8*exp(x) + (3 + 10*x)*exp(2*x))*exp(-x). - G. C. Greubel, Jul 16 2016
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MATHEMATICA
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Table[5 n/2 + 3/4 + 5 (-1)^n/4, {n, 70}] (* Bruno Berselli, Sep 16 2013 *)
CoefficientList[Series[- (- 2 - 5 x + 2 x^2) / ((1 + x) (x - 1)^2), {x, 0, 70}], x] (* Vincenzo Librandi, Sep 16 2013 *)
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PROG
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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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EXTENSIONS
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STATUS
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approved
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