The document provides the first three terms of four recursively defined sequences. The four sequences are: 1) a1=21, an=3an-1; 2) a1=41, an=1/an-1; 3) a1=21, an=(-3)nan-1; 4) a1=21, an=(an-1)^n. The solutions given are: 1) a1 =2, a2 = 6, a3 = 18; 2) a1 = 4, a2 = 1/4, a3 = 4; 3) a1 = 2, a2 = -12, a3 = 108; 4) a1= 2, a2 =