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1, 2, 5, 18, 68, 283, 1161, 4843, 19985, 83074, 349670, 1456458, 6107257, 25547835, 106115655, 440396113, 1833079809, 7642924612, 31705433101, 131711607956, 546283729493, 2257462298234, 9339325821411, 38593708318690, 159600066415313, 661371515924516, 2736805917843710
(列表;图表;参考;听;历史;文本;内部格式)
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