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1, 2, 6, 28, 182, 1640, 19220, 278224, 4809942, 96598622, 2208156512, 56580566908, 1605518324884, 49963000166616, 1691615823420800, 61897541544248720, 2433873670903995990, 102341746590575878628, 4582360425862350559350, 217661837260679635780356
(列表;图表;参考;听;历史;文本;内部格式)
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