Calculate Rayleigh - Schrodinger perturbation series for the sextic anharmonic oscillator

Hamiltonian of the sextic anharmonic oscillator has the form:
H = p²/2 + x²/2 + g x⁶, where g is a small perturbation parameter.

The energy is expanded in powers of g:
E(g) = E₀ + E₁ g + ... + E_N g^N, where
      E₀ = n + 1/2 is unperturbed harmonic-oscillator energy,
      n is the harmonic oscillator quantum number, and
      N is the order of perturbation theory.

Download a text of the Mathematica program that is used for this calculation

435 coefficients of the ground-state energy expansion calculated earlier.

Directory of Sergeev's files Designed by A. Sergeev

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Enter the oscillator quantum number	n =	n = 0 for the ground state, 1,2,3,... for excited states.
Enter the order of perturbation theory	N =	N = 1,2,3,...