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1, 1, 5, 19, 71, 287, 1227, 5225, 22533, 98501, 435789, 1937773, 8674229, 39013929, 176395377, 800429171, 3645660451, 16650259179, 76271644403, 350201421263, 1611730662275, 7431609599983, 34333249277507, 158871090135623, 736334386517187, 3417419972522207, 15882375410713987, 73900270630169779
(列表;图表;参考;听;历史;文本;内部格式)
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