Double wells and triple wells quantum oscillators

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The Hamiltonion for the double well and triple wells can be written in form $H=H_0-x^2+x^4$ and $H=H_0+x^2-x^4+x^6$, repectively. Can anyboody guide which "basis function" can be used to construct the corresponding matrix elements for double and triple wells (which full-fills the BC's).? Please also tell me which method can be used to calculate the matrix elemnents,which may includes number of Gaussian integrals to solve.(Waiting for yours suggestion).+