Further Formulae for Harmonic Series with Convergence Rate “−1/4”

By applying the “coefficient extraction method” to the symmetric transformation of hypergeometric series due to Chu and Zhang (2014), an overview is presented systematically for a large class of infinite series of convergence rate “−1/4” concerning harmonic numbers. Numerous closed formulae in terms of mathematical constants (such as π, ln2 and the Riemann zeta values) are established. They may serve as a reference source for readers in their further investigations.