an of order n can be determined using the probabilistic Hermite polynomials. They are explicitly written as: Hn(x) = 2 ** (-n / s) * n! * sum ((-1) ** m) * (2 ** 0.5 * x) ** (n - 2 * m) / (m! * (n - 2*m)!) or in the recursive form: Hn(x) = x * Hn(x) - nHn-1(x)</p>
<p>Source: <a href="http://www.ask.com/wiki/Hermite_polynomials">http://www.ask.com/wiki/Hermite_polynomials</a> </p>

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