/ 2 \
4*\polygamma (0, 1 + 2*x) + polygamma(1, 1 + 2*x)/*gamma(1 + 2*x)
$$4 \left(\operatorname{polygamma}^{2}{\left (0,2 x + 1 \right )} + \operatorname{polygamma}{\left (1,2 x + 1 \right )}\right) \Gamma{\left(2 x + 1 \right)}$$
/ 3 \
8*\polygamma (0, 1 + 2*x) + 3*polygamma(0, 1 + 2*x)*polygamma(1, 1 + 2*x) + polygamma(2, 1 + 2*x)/*gamma(1 + 2*x)
$$8 \left(\operatorname{polygamma}^{3}{\left (0,2 x + 1 \right )} + 3 \operatorname{polygamma}{\left (0,2 x + 1 \right )} \operatorname{polygamma}{\left (1,2 x + 1 \right )} + \operatorname{polygamma}{\left (2,2 x + 1 \right )}\right) \Gamma{\left(2 x + 1 \right)}$$