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U4 = 4(3x4+2) = 4 x 14 = 56
U6 = 6(3x6+2) = 6 x 20 = 120
U8 = 8(3x8+2) = 8 x 26 = 208
U14 = 14(3x14+2) = 14 x 44 = 616