Identify the recursive formula for the following sequence: 8, 26, 80, 242, . . .
A. an = an – 1 + 18 where a1 = 8
B. an = 3an – 1 + 2 where a1 = 8
C. an = 4an – 1 – 6 where a1 = 242
D. an = 8 + (n–1) · 18 where a1 = 18