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1, 2, 6, 18, 54, 162, 486, 1458, 4374, 13122, 39366, 117074, 348151, 1038313, 3098572, 9246640, 27592792, 82337392, 245690824, 733114816, 2187497080, 6527051536, 19475245096, 58109645152, 173387205336, 517354196145, 1543686280857
(列表;图表;参考;听;历史;文本;内部格式)
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