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1, 1, 4, 11, 42, 151, 597, 2378, 9788, 40882, 173588, 745698, 3237487, 14175810, 62544126, 277703191, 1240091242, 5564821058, 25082363701, 113493074323, 515341994973, 2347383158755, 10722871159531, 49108802008133, 225440567737862, 1037148875601554, 4780909060419277, 22078621364281286
(列表;图表;参考;听;历史;文本;内部格式)
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