Generalized Binomial Expansion

If the function \(f(x) = \sqrt{1 + x}\) is expanded out in terms of powers of \(x\) such that \(f(x) = \sum\limits_{k=0}^{\infty} a_{k} x^{k}\), what is the the coefficient \(a_{3}\) of the \(x^{3}\) term?

Express your answer as an exact decimal.

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