# data[].attributes.body
1.   since you're looking for the 3rd term you would plug in 3 for n in b(n)=b(n-1)-7.
2.   solve whats in the parenthesis only.
3.   Then you plug in 2 so that b(2)=b(2-1)-7. solve whats in the parenthesis only, which should make that part b(1).
4.   since it gives use b(1)=-2, plug that in to b(2)=b(1)-7.
5.   solve that and you get b(2)=-9. So that gets plugged into b(3)=b(2)-7.
6. Solving that gives you -16.

-Ahmed E.
_Jeremy S.