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U2 = 2^2 + 2 = 4 + 2 = 6
U3 = 3^2 + 2 = 9 + 2 = 11
U4 = 4^2 + 2 = 16 + 2 = 18
U5 = 5^2 + 2 = 25 + 2 = 27