Hi Sarah. Here's a hint: it is a "geometric sequence". So that means that each successive term is multiplied by the same factor. For example, 9, 27, 81, 243, ... has a common factor of 3 (each term is just the last term times 3). Yours is like this. Geometric sequences have an nth term of the form a f^n-1 where a is the first term, f is the common factor and n is the number of the term (nth term).

With my example, the nth term is 9 3^n-1, which reduces to 3ⁿ⁺¹. Can you do something like this for your sequence?

Stephen La Rocque.>