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1, 1, 2, 5, 14, 43, 143, 507, 1887, 7279, 28828, 116455, 477709, 1983779, 8321474, 35203777, 150014157, 643302743, 2773997104, 12020733635, 52319374842, 228616865437, 1002544803949, 4410700121313, 19462407890220, 86111960348939, 381956399941011
(列表;图表;参考;听;历史;文本;内部格式)
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