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1, 1, 1, 2, 5, 10, 29, 72, 230, 700, 2421, 8308, 30070, 108990, 403188, 1497057, 5607200, 21076570, 79595257, 301492044, 1145558141, 4363503609, 16660196142, 63741248200, 244339616370, 938255682540, 3608668279965, 13900021843855, 53614339995060, 207062143625710
(列表;图表;参考;听;历史;文本;内部格式)
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