Which number replaces the question mark?

This is very interesting and an easy number series puzzle. In this number series puzzle, you are shown a series of numbers. These numbers follow some mathematical pattern. Can you find this mathematical pattern in this number series and find the next number in this series which will replace the question mark?  

Which number replaces the question mark?

The answer to this "Missing Number Series Puzzle", can be viewed by clicking on the answer button.

The Answer is 68.
The difference in two consecutive terms doubles from left to right. It means starting difference is 2, then 4, 6 and so on.

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