My sequence starts at 4. Double 4 to get 8. 8 minus 3 to get 5. Double 5 to get 10. 10 minus 3 to get 7 double 7 to get 14 and so forth.

4, 8, 5, 10, 7, 14, 11, 22, 19, 38........

It can be simplified for my specific needs, as I only care about every other number, starting with 8.

8, 10, 14, 22, 38, 70........

I double the difference with every number; since 8 + 2 = 10, 10 + 4 = 14, 14 + 8 = 22, 22 + 16 = 38 and 38 + 32 = 70

a. How can I figure out the

equation for this sequence?

b. Is there a way to figure out the equation for the original sequence?

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