This is the alpha version of the code. Please visit this page regularly for the improved versions.
For theory, see:
T. Birkandan, P.-L. Giscard, A. Tamar, "Computations of general Heun functions from their integral series representations", IEEE XPlore, Proceedings of the International Conference DAYS on DIFFRACTION 2021, pp. 12–18 (2021) (arXiv: 2106.13729 [math.NA])
Based on P.-L. Giscard, A. Tamar, "Elementary Integral Series for Heun Functions. With an Application to Black-Hole Perturbation Theory", arXiv:2010.03919 [math-ph].