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masukan n=2 ----> f(3) = 2.f(2) + f(1) = 2.1 + 1 = 3
masukan n=3 ----> f(4) = 2.f(3) + f(2) = 2.3 + 1 = 7
masukan n=4 ----> f(5) = 2.f(4) + f(3) = 2.7 + 3 = 17
f(5) = 17