Appendix

$$\left. \begin{array}{l@{}l} B_{4,1}(H) &\, = \, H^4- 32H^2... ... + 2211840H^4 - 141557760H^2+188743680 \end{array} \right\}$$ (13)

$$\left. \begin{array}{l@{}l} E_{4,1}(H) &\, = \, H^2(H^2-16... ...hspace{1.5cm} +7372800H^2 +23592960) \end{array} \right\}$$ (14)

$$\left. \begin{array}{l@{}l} F_{4,1}(H) &\, = \, -\frac{1}{... ...H^6 - 2560H^4 + 30720H^2-142656) \\ \end{array} \right\}$$ (15)