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1, 0, 2, 5, 23, 106, 537, 3143, 20485, 143747, 1078660, 8680687, 74914773, 690204588, 6749661220, 69732043730, 758671016406, 8674112392913, 104037242257509, 1306629414101911, 17148719951169617, 234689253311285406, 3342159005325362828, 49430840838485256475
(列表;图表;参考;听;历史;文本;内部格式)
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