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S1 = 1 --> 1
S2 = 4 -->
S3 = 9 -->
Sn =
S9 =
2.
U3 = 7 --> 3 x 2 + 1
U7 = 15 --> 7x2 + 1
U1 = 3
U2 = 5
S1 = 3
S2 = 3 + 5 = 8
S3 = 3 + 5 +7 = 15
S4 = 15 + 9 = 24
Sn = (n+2) x n
S30 = 32 x 30 = 960