It returns a 1. According to the math-like definition, this is not correct.
Say that a female rabbit is mature 2 months after birth. Assume that each mature female rabbit produces 1 baby female rabbit per month. If you start out with one baby female rabbit, how many female rabbits will you have in 10 months? Assume that there are enough male rabbits to ensure maximum production, and that no rabbits die.
Here is a chart:
The chart shows the number of rabbits at the end of the first month, at the end of the second month, and so on.