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2, 6, 19, 65, 222, 776, 2682, 9310, 32288, 112036, 388710, 1348756, 4679860, 16238178, 56343110, 195499228, 678342902, 2353713428, 8166912404, 28337544624, 98325585264, 341170022526, 1183791422522, 4107518363162, 14252263353112
(列表;图表;参考;听;历史;文本;内部格式)
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