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0, 1, 6, 46, 336, 2476, 18216, 134056, 986496, 7259536, 53422176, 393128416, 2892992256, 21289237696, 156665348736, 1152884469376, 8483960303616, 62432606515456, 459435242128896, 3380937517927936, 24879977528856576, 183089240352418816, 1347335217403078656
(列表;图表;参考;听;历史;文本;内部格式)
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