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Un = n³⁻¹
U1 = 1²
U1 = 1 = a
cari suku ke-8 :
U8 = 8²
U8 = 64
baru cari jumlah 8 suku pertama :
Sn = n/2 (a + Un)
S8 = 8/2 (1 + 64)
S8 = 4 (65)
S8 = 260
Jadi, jumlah 8 suku pertama barisan tersebut adalah 260.