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Using the Ratio Test gives the convergence of the series if `lim_(n->oo)((a^(n+1))/((n+1)^3))/((a^n)/(n^3)) < 1`
`lim_(n->oo)a^(n+1 - n)/(((n+1)^3)/n^3)`
when `n->oo, 1/n->0`
As the value of a is not known, nothing can be said about a < 1.
It is not possible to determine if the given series is convergent using the Ratio Test.
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