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1, 1, 1, 2, 4, 15, 80, 506, 3711, 30921, 288592, 2982110, 33797241, 416832634, 5557768441, 79661347642, 1221473997165, 19950741953682, 345812860530488, 6339902443058942, 122571447232472866, 2492286093726948269, 53168769999508229721, 1187435863322350463748
(列表;图表;参考;听;历史;文本;内部格式)
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