Match the temples in Group I with their style of Architecture in Group II.
\[\begin{array}{|c|c|} \hline \textbf{Group I} & \textbf{Group II} \\ \hline \text{P: Badami Cave Temples} & \text{1: Pandya style} \\ \hline \text{Q: Kalugumalai Temple Complex} & \text{2: Chola style} \\ \hline \text{R: Airavatesvara Temple} & \text{3: Chalukya style} \\ \hline \text{S: Chennakeshava Temple} & \text{4: Vijayanagara style} \\ \hline & \text{5: Hoysala style} \\ \hline \end{array}\]
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)