a(1) = 1,25
a(2) = 4
a(n) = a(n - 2) * a(n - 1)
..., 2000, 200000
b(1) = -3
b(2) = -2
b(n) = b(n - 2) * b(n - 1)
..., 864, -62208
9.3m questions
12.0m answers