Six people, namely P, Q, R, S, T and U are sitting in a row facing north.
Further it is known that:
(i) Exactly two people are sitting between P and Q.
(ii) Exactly one person is sitting between T and U.
(iii) Q is sitting at the right end of the row.
If U is sitting adjacent to S, then how many people are sitting between U and R?
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)