SOLUTION: What is the pattern? 1, -4, 9, -16

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Question 1071717: What is the pattern? 1, -4, 9, -16
Answer by math_helper(2461) About Me  (Show Source):
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a1 = 1
a2 = -4
a3 = 9
a4 = -16
:
a%5Bn%5D+=+%28-1%29%5E%28n%2B1%29%2An%5E2 (+n+%3E=+1+ )