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How it works: OI(1) = 1 OI(2) = 1 + 2 = 3 OI(3) = 1 + 2 x 3 = 1 + 6 = 7 OI(4) = 1 + 2 x 3^4 = 1 + 2 x 81 = 1 + 162 = 163 OI(5) = 1 + 2 x 3^(4^^5) = 1 + 2 x 3^1.34078079e154 = 1 + 2 x 6.396e153 = 1 + 12.792e153 = 12.792e153