SeriesCoefficient[(1+q*x)*(1+q^2*x)*(1+q^3*x)*(1+q^4*x)*(1+q^5*x),{x,0,3}]SeriesCoefficient[(1+q*x)*(1+q^2*x)*(1+q^3*x)*(1+q^4*x)*(1+q^5*x),{x,0,3}]

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