Fill in the correct number in this sequence:
\begin{array} & 3 & 4 & 2^2 & 5 & 10 & 60 & ? \end{array}
The options are
\begin{array} 60/10 & 6 & 12/2 & 7 & 49/7 \end{array}
So, apparently, the answer is either $6$ or $7$, but why? Also, I do not understand why the 4 is written in terms of a square and is present 2 times in the sequence. I have no clue how to solve it.
Source: a publicly available practice test in a book for an IQ-test I got via a friend in the Netherlands.