Show by the Principle of Mathematical induction that the sum \( S_{n} \) of the \( n \) terms of...

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Show by the Principle of Mathematical induction that the sum \( S_{n} \) of the \( n \) terms of the series \( 1^{2}+2 \times 2^{2}+3^{2}+2 \times 4^{2} \) \( +5^{2}+2 \times 6^{2}+7^{2}+\ldots \) is given by
\( S_{n}=\left\{\begin{array}{ll}\frac{n(n+1)^{2}}{2}, & \text { if } n \text { is even } \\ \frac{n^{2}(n+1)}{2}, & \text { if } n \text { is odd }\end{array}\right. \)
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