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0, 1, 4, 25, 170, 1204, 8736, 64416, 480480, 3615040, 27382784, 208539136, 1595216896, 12247746560, 94330470400, 728474664960, 5638832087040, 43737154928640, 339856038297600, 2645063771750400, 20615846154731520, 160889637246074880, 1257082279931412480
(列表;图表;参考;听;历史;文本;内部格式)
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