Final answer:
The formula for the nth term of the given sequence is Term n = (-1)^n * n^2.
Step-by-step explanation:
Based on the given sequence, we can observe that the terms are alternating between positive and negative perfect squares. The pattern can be represented as follows:
Term 1: 1 = 1^2
Term 2: -4 = (-2)^2
Term 3: 9 = 3^2
Term 4: -16 = (-4)^2
Term 5: 25 = 5^2
For the nth term, we can use the formula:
Term n = (-1)^n * n^2