Question 932968
The sequence meant is probably -3,3,-5,5,-3,3,-5,5,-3,3,-5,5,.... ,-3,3,-5,5,.... 
where the same four terms are recycled over, and over again,
so the 4th, 8th, 12th, 16th, ..., 80th, and 84th terms are {{{highlight(5)}}} .