Recursion Formula

[Poweranimals]

Do you guys know what the recursion formula for this series?

http://ourworld.cs.com/SuperSamuraiStar/math.bmp

[Tide]

If

a_n = r^n

then

a_{n+1} = r^{n+1} = r \times r^n = r a_n

but you knew that! :-)