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1, 1, 3, 11, 45, 197, 902, 4269, 20717, 102531, 515521, 2625909, 13521776, 70274194, 368131940, 1941801115, 10304601189, 54976677289, 294708283729, 1586565791533, 8574185062861, 46498569928775, 252966168370110, 1380203261726925, 7550534790990360
(列表;图表;参考;听;历史;文本;内部格式)
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