Find the sum of the following series up to n terms : `(1^3)/1+(1^3+2^2)/(1+3)+(1^3+2^3+3^3)/(1+3+5)+dotdotdot`

Explanation

To find the sum of the series up to \( n \) terms given by

\[ S_n = \frac{1^3}{1} + \frac{1^3 + 2^3}{1 + 3} + \frac{1^3 + 2^3 + 3^3}{1 + 3 + 5} + \ldots \]

we can denote the \( r \)-th term of the series as \( a_r \).

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