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1, 3, 6, 13, 26, 53, 107, 215, 430, 861, 1723, 3447, 6895, 13791, 27583, 55167, 110334, 220669, 441339, 882679, 1765359, 3530719, 7061439, 14122879, 28245759, 56491519, 112983039, 225966079, 451932159, 903864319, 1807728639, 3615457279, 7230914558
(列表;图表;参考;听;历史;文本;内部格式)
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