16 8 12 30 ? 472.5
Odd multiples of $$\frac{1}{2}$$ are multiplied
16 $$\times \frac{1}{2}$$ = 8
8 $$\times \frac{3}{2}$$ = 12
12 $$\times \frac{5}{2}$$ = 30
30 $$\times \frac{7}{2}$$ = 105
105 $$\times \frac{9}{2}$$ = 472.5
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