How do I create a recursive definition using the values 80,77,74,71,68...?

I already have the value table set up:

Where do I go from here?

Hi Adam,

80, 77, 74, 71, 68

They keep getting 3 smaller so how about

\(T_{n+1}=T_{n}-3\qquad where \;\;T_1=80\quad and \quad n\ge1 \quad and\;\; n\in Z\)

I am not really sure how these are supposed to be presented but that is what I would do. :)

Thanks a ton! This is exactly what I needed!