Solving explicit formula

I need a explicit formula for the following sequence:
10, 20, 40, 80, 160
i understand the patern but cant find a formula for it

For n = 1, 2, 3...., the formula is
10(2^(n-1))
When n = 1, 10(2^0) = 10(1) = 10
When n = 2, 10(2^1) = 10(2) = 20
When n = 3, 10(2^2) = 10(4) = 40
When n = 4, 10(2^3) = 10(8) = 80
When n = 5, 10(2^4) = 10(16) = 160