  The pseudoperturbative shifted - $l$ expansion technique PSLET [12,16] is
generalized for states with arbitrary number of nodal zeros. Interdimensional
degeneracies, emerging from the isomorphism between angular momentum and
dimensionality of the central force Schr\"odinger equation, are used to
construct part of the D - dimensional anharmonic oscillator bound - state
spectra. PSLET results are found to compare excellently with those from a
series [5], exact and open perturbation [9] solutions.
