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0, 1, 1, 3, 8, 22, 60, 168, 466, 1306, 3677, 10400, 29503, 83969, 239533, 684880, 1961986, 5630451, 16182950, 46577929, 134228796, 387264335, 1118459507, 3233302665, 9355173164, 27089886520, 78502923212, 227648300409, 660574571072, 1917958785876, 5571852459248
(列表;图表;参考;听;历史;文本;内部格式)
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