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1, 0, 0, 0, 1, 5, 15, 35, 71, 131, 230, 395, 686, 1231, 2316, 4565, 9326, 19466, 41002, 86401, 181231, 377441, 779797, 1598263, 3251522, 6571171, 13204057, 26404654, 52595856, 104445292, 206934917, 409352089, 809015298, 1598295894, 3157969548, 6242861979
(列表;图表;参考;听;历史;文本;内部格式)
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