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1, 3, 6, 13, 27, 52, 110, 211, 444, 834, 1761, 3387, 7110, 13357, 28187, 54188, 113750, 213755, 450948, 867054, 1819931, 3420076, 7215326, 13873075, 29118668, 54720818, 115445453, 221968691, 465897164, 875530546, 1847121613, 3551504691, 7454357196
(列表;图表;参考;听;历史;文本;内部格式)
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