Hi can someone help me figure this out:

I know its convergent, but I'm trying to figure out how to get it into the form:

a/1-r

If you notice, when n = 1, the first term is always 1. Then it becomes 1+7^2/8^2 all the way till n.

I figured that r should be 1/8 since each preceding term differs by a factor of 1/8. Can't figure out a though. Any ideas?