5. Recursive Definitions (4 points) Write down the first 5 elements of the sequence, then give a recursive definition for an (where n 2 1) 1) an = (-1)" + (-1)" a) First 5 elements: b) Base case: ai- c) Recursive case: an 2) an n/2 a) First 5 elements: b) Base case: ai- c) Recursive case: an