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Polygamma Function

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Calculates the value of the polygamma function Ψn(a).
Order of differentiation n
　n=-1,0,1,2,3,4
a
\(\normalsize Polygamma\ function\ \Psi_n(a)\\ (1)\ \Psi_{n-1}(a)={\large\frac{d^n}{da^n}}\ln\Gamma(a),\hspace{10px}n=-1,0,1,2,3,4\\ (2)\ \Psi_{\small -1}(a)=\ln\Gamma(a)\\ (3)\ \Psi(a)=\Psi_{\small 0}(a)={\large\frac{d}{da}}\ln\Gamma(a)\hspace{20px}Digamma\\\)

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