For hydrogenic (one-electron) species like \(\text{H}\), \(\text{He}^+\), and \(\text{Li}^{2+}\), all subshells within a major shell are degenerate, meaning total degeneracy is simply \(n^2\). Note that if a problem explicitly mentions "including spin", you must multiply the result by \(2\), making it \(2n^2\).