69, 35.5, 39.5, 68.25, 152.5, ?
69 × 0.5 + 1² = 35.5 35.5 × 1 + 2² = 39.5 39.5 × 1.5 + 3² = 68.25 68.25 × 2 + 4² = 152.5 152.5 × 2.5 + 5² = 406.25
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