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1, 2, 4, 11, 28, 91, 291, 1004, 3471, 12350, 44114, 159519, 579835, 2121845, 7800702, 28813730, 106844383, 397647256, 1484755972, 5560561040, 20881939915, 78617991116, 296678132514, 1121988213996, 4251702739831, 16141719280994, 61389611762126, 233856524866209
(列表;图表;参考;听;历史;文本;内部格式)
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