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A053484
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Numerators in expansion of exp(2x)/(1-x).
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3
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1, 3, 5, 19, 7, 109, 331, 155, 2327, 20947, 34913, 164591, 691283, 14977801, 314533829, 4718007451, 1572669151, 16041225341, 103122162907, 4571749222213, 68576238333199, 110777000384399, 55582845806909, 364345554264288511
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OFFSET
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0,2
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LINKS
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FORMULA
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MATHEMATICA
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Numerator[Table[Sum[2^k/k!, {k, 0, n}], {n, 0, 30}]] (* Alexander Adamchuk, Jul 22 2006 *)
Numerator[Accumulate[Table[2^n/n!, {n, 0, 30}]]] (* or *) Numerator[ CoefficientList[ Series[Exp[2x]/(1-x), {x, 0, 30}], x] ] (* Harvey P. Dale, Mar 12 2017 *)
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PROG
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(PARI) for(n=0, 25, print1(numerator(sum(k=0, n, 2^k/k!)), ", ")) \\ G. C. Greubel, Jan 18 2017
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CROSSREFS
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KEYWORD
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nonn,frac
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AUTHOR
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STATUS
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approved
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