  The energy eigenvalues of the anharmonic oscillator characterized by the
cubic potential for various eigenstates are determined within the framework of
the hypervirial-Pad\'e summation method. For this purpose the E[3,3] and E[3,4]
Pad\'e approximants are formed to the energy perturbation series and given the
energy eigenvalues up to fourth order in terms of the anharmonicity parameter
$\lambda$.
