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1, 1, 2, 7, 20, 58, 174, 519, 1550, 4634, 13884, 41616, 124824, 374390, 1123288, 3369297, 10107324, 30320434, 90961626, 272878138, 818632094, 2455888346, 7367661682, 22102935920, 66308767426, 198926187730, 596778527246, 1790335274112, 5371006016314
(列表;图表;参考;听;历史;文本;内部格式)
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