Chapter 9 - Section 9.1 - Sequences - 9.1 Assess Your Understanding - Page 647: 43

The first five terms are: $a_1= 1$ $a_2 = 2$ $a_3 = 2$ $a_4 = 4$ $a_5= 8$

Use the given recursive formula to find the next four terms: $a_1= 1$ $a_2 = 2$ $a_3 = a_2 \cdot a_1=2(1)=2$ $a_4 = a_3 \cdot a_2 = 2(2)=4$ $a_5= a_4 \cdot a_3 = 4(2) = 8$