  The present contribution concerns the computation of energy eigenvalues of a
perturbed anharmonic coulombic potential with irregular singularities using a
combination of the Sinc collocation method and the double exponential
transformation. This method provides a highly efficient and accurate algorithm
to compute the energy eigenvalues of one-dimensional time-independent
Schr\"odinger equation. The numerical results obtained illustrate clearly the
highly efficiency and accuracy of the proposed method. All our codes are
written in Julia and are available on github at
\url{https://github.com/pjgaudre/DESincEig.jl}.
