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1, 1, 3, 8, 26, 83, 289, 999, 3600, 12955, 47849, 176552, 661939, 2482659, 9412263, 35707725, 136454697, 521967439, 2007069109, 7725358220, 29848113425, 115440484663, 447751809956, 1738330224040, 6763528650892, 26339260716779, 102749051187162, 401150111109149, 1568301977278095
(列表;图表;参考;听;历史;文本;内部格式)
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