Answer:
The first five terms are: 5,10,20,40,80
Explanation:
The given sequence is defined explicitly as:

We want to find the first five terms of this sequence:
For the first term, n=1,

When n=2,

When n=3,
We have

When n=4, we get:

When n=5,

The first five terms are: 5,10,20,40,80