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1, 1, 8, 72, 684, 6876, 72924, 814056, 9544164, 117284766, 1507813722, 20243939784, 283383218358, 4129738188546, 62563457162916, 983985264479016, 16046556350152008, 271012423865891076, 4735104984115971090, 85496795448023574282, 1593757450233067980306
(列表;图表;参考;听;历史;文本;内部格式)
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