What is the missing number in the sequence 4, 6, 10, 18, …… , 66?

What is the missing number in the sequence 4, 6, 10, 18, …… , 66?

Explanation
4 + 2 =6 
6 + 4 = 10
10 + 8 = 18
18 + 16 = 34
34 + 32 = 66