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We use the tridiagonal representation approach to obtain an exact solution ofthe three-dimensional radial Schr\"odinger equation for a spiked oscillatorwith inverse quartic singularity and for all angular momenta. The solution is afinite series of square integrable functions written in terms of the Besselpolynomial.

Finite series representation for the bound states of a spiked isotropic oscillator with inverse-quartic singularity