Characteristic polynomial
$$\begin{equation}\left(\lambda + 2\right)^{2} \left(\lambda^{3} + 4 \lambda^{2} - 13 \lambda - 59\right) \left(\lambda^{11} + 8 \lambda^{10} + 9 \lambda^{9} - 443 \lambda^{8} - 5304 \lambda^{7} - 32747 \lambda^{6} - 123108 \lambda^{5} - 254172 \lambda^{4} + 72946 \lambda^{3} + 2145890 \lambda^{2} + 4047232 \lambda - 288031\right)\notag\end{equation}$$
Minimal polynomial
$$\begin{equation}\left(\lambda + 2\right) \left(\lambda^{3} + 4 \lambda^{2} - 13 \lambda - 59\right) \left(\lambda^{11} + 8 \lambda^{10} + 9 \lambda^{9} - 443 \lambda^{8} - 5304 \lambda^{7} - 32747 \lambda^{6} - 123108 \lambda^{5} - 254172 \lambda^{4} + 72946 \lambda^{3} + 2145890 \lambda^{2} + 4047232 \lambda - 288031\right)\notag\end{equation}$$
Quantum multiplication matrix
$$\begin{equation}\begin{pmatrix}0 & 2 & 4 & 2 & 0 & 3 & 0 & 6 & 9 & 6 & 6 & 8 & 8 & 8 & 8 & 10 \\ 1 & -1 & 1 & 0 & 0 & 2 & 0 & 0 & 2 & 0 & 0 & 6 & 6 & 0 & 0 & 8 \\ 1 & 1 & -1 & 1 & 0 & 0 & 0 & 0 & 0 & 4 & 4 & 0 & 0 & 0 & 6 & 0 \\ 1 & 0 & 1 & -1 & 2 & 2 & 0 & 0 & 2 & -4 & -4 & 0 & 0 & 0 & -6 & 0 \\ 1 & 0 & 0 & 0 & -1 & 0 & 2 & 4 & 2 & 2 & 2 & 3 & 3 & 6 & 6 & 8 \\ 0 & 2 & 1 & 1 & 0 & -1 & 2 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 & 1 & 0 & -2 & 1 & 0 & 0 & 0 & 2 & 2 & 0 & 0 & 6 \\ 0 & 0 & 1 & 0 & 1 & 0 & 1 & -2 & 0 & 1 & 1 & 0 & 0 & 0 & 4 & 0 \\ 0 & 0 & 2 & 1 & 0 & 1 & 0 & 2 & -1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 1 & 3 & 0 & 0 & 1 & 0 & -2 & -1 & 2 & 0 & 8 & 0 & 6 \\ 0 & 0 & 0 & 1 & -2 & 0 & 0 & 0 & 1 & 2 & 0 & 0 & 2 & -8 & -4 & -6 \\ 0 & 0 & 0 & 0 & 0 & 1 & 4 & -1 & -3 & 0 & -1 & -3 & -1 & 0 & 0 & 4 \\ 0 & 0 & 0 & 0 & 0 & 2 & -2 & 4 & 7 & 2 & 3 & 4 & 1 & 2 & 0 & -4 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 3 & 2 & 1 & \frac{1}{2} & 1 & \frac{1}{2} & -1 & 1 & 0 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 2 & \frac{3}{2} & 0 & 0 & 1 & -1 & 2 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 3 & 2 & 3 & 2 & 0\end{pmatrix}\notag\end{equation}$$