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U2 = 9 = 3²
U3 = 36 = 6²
U4 = 100 = 10²
Un = (n/2 (2 + (n - 1)1))²
= (n/2 (2 + n - 1))²
= (n/2 (1 + n))²
Un = (1/2 (n (n+1))²