There's no pattern for that.
Start with 1
Multiply by the 1st prime 2, to get 2.
Then mutiply by the 2nd prime 3, to get 6.
Then mutiply by the 3rd prime 5, to get 30.
Then it ought to mutiply by the 4th prime 7, to get 210.
But it gets 68 by mistake. So it's a misprint.
Edwin