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6, 40, 308, 2260, 16812, 124644, 924900, 6862052, 50913012, 377747700, 2802692276, 20794524084, 154284599124, 1144711823796, 8493168927828, 63014915159220, 467538037568404, 3468890119531892, 25737368287958996, 190957944347003188
(列表;图表;参考;听;历史;文本;内部格式)
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