
Donald Q. answered 07/08/15
Tutor
New to Wyzant
Guess And Check Discovery
Since the problem seems incomplete, I think it might be that a(n+1) = √a(n)
a(1) = 256
a(2) = √a(1) = √256 = 16
a(3) = √a(2) = √16 = 4
a(4) = √a(3) = √4 = 2