13, 13, 20, 37.5, 83, ?
$$13 \times 0.5 + 6.5 = 13$$
$$13 \times 1 + 7 = 20$$
$$20 \times 1.5 + 7.5 = 37.5$$
$$37.5 \times 2 + 8 = 83$$
$$83 \times 2.5 + 8.5 = 216$$
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