As I understand this, * + * … * means the following:

First— * + * sums the two previous elements in the list. … * tells this to do this an infinite number of times; i.e.

1, 1, (1 + 1)

1, 1, 2, (1 + 2)

1, 1, 2, 3, (2 + 3)

1, 1, 2, 3, 5, (3 + 5)

1, 1, 2, 3, 5, 8, (5 + 8), etc.

… three dots means that it does it lazy, i.e. that it does not generate an element before you call it. This can be good for large lists that are computationally heavy.