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1, 1, 4, 17, 123, 739, 8888, 71105, 1066698, 13867091, 249608380, 2995300561, 83868424715, 1174157946011, 28179790775372, 676314978609683, 20965764337966871, 377383758083403679, 14717966565266619443, 294359331305332388861, 12363091914824209940661, 395618941274374718172273
(列表;图表;参考;听;历史;文本;内部格式)
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