Final answer:
The student's question regarding the first four terms of a sequence with a recursive formula cannot be answered due to a lack of a clear formula and initial term. A correct recursive formula is needed to proceed with the solution.
Step-by-step explanation:
The student appears to be asking about writing the first four terms of a recursively defined sequence. However, the formula provided is unclear. We would typically expect a recursive formula to be in the form an = expression involving an-1, where an is the nth term of the sequence, and an-1 is the previous term. For correct recursive formulas, the sequence usually starts with an initial term, often referred to as a1, and each subsequent term is defined in terms of the previous one.
Without the correct form of the recursive formula and the initial term, we cannot determine the first four terms of the sequence. It's important to ask the student to provide the correct recursive formula and the initial term to proceed with providing accurate assistance.