“…One can obtain the individual energy eigenvalues one by one, that is, E 1 , E 2 , E 3 by imposing the additional recurrence condition c n+1 = 0 on the eigenvalue. The solution with Heun's Equation makes it possible to obtain the eigenvalues one by one as done in [3,5,7,12,19,50,51,52,53,54,57,59,71,74,85,86,92,93] but not explicitly in the general form by all eigenvalues n. With the aim of obtaining the energy levels of the stationary states, let us discuss a particular case of n = 1. This means that we want to construct a polynomial of first degree to H(x).…”