These are the first six terms of a sequence with a1 = -5 and a2 = -1: -5, -1, 7, -13,...

These are the first six terms of a sequence with a1 = -5 and a2 = -1:

-5, -1, 7, -13, 19, -25, ...

Find a recursive formula for this sequence that is valid for n > 2.

Write your answer in simplest form.