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U5 = 1/2 . 5 . 8
U5 = 5 .4
U5 = 20
Un = 1/2 n (n + 3)
U1 = 1/2 (1) (1 + 3) = 2
U2 = 1/2 (2) (2 + 3) = 5
U3 = 1/2 (3) (3 + 3) = 9
U4 = 1/2 (4) (4 + 3) = 14
U5 = 1/2 (5) (5 + 3) = 20