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1, 2, 6, 34, 116, 438, 1606, 6002, 22548, 85342, 324716, 1241166, 4762000, 18329054, 70742790, 273689362, 1061055812, 4121135838, 16032654628, 62463904958, 243682621224, 951781620022, 3721520393036, 14565753339054, 57060974849656, 223721451300518, 877830004120296
(列表;图表;参考;听;历史;文本;内部格式)
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