Instructions

What should come in place of question mark (?) in the following number series?

Question 30

-1, 2, 7, 14, 23, ?

$$1 \times 2 - 3 = -1$$
$$2 \times 3 - 4 = 2$$
$$3 \times 4 - 5 = 7$$
$$4 \times 5 - 6 = 14$$
$$5 \times 6 - 7 = 23$$
$$6 \times 7 - 8 = 34$$

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