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1, 2, 6, 19, 67, 249, 964, 3850, 15727, 65470, 276659, 1183644, 5117229, 22318698, 98081642, 433863665, 1930189533, 8630458362, 38761928782, 174784980244, 790957057597, 3590859857448, 16349677462846, 74639892420144, 341573289801870, 1566608313475864, 7199847839030811, 33151568052565316
(列表;图表;参考;听;历史;文本;内部格式)
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