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1, 3, 1, 3, 2, 6, 5, 15, 14, 42, 42, 126, 132, 396, 429, 1287, 1430, 4290, 4862, 14586, 16796, 50388, 58786, 176358, 208012, 624036, 742900, 2228700, 2674440, 8023320, 9694845, 29084535, 35357670, 106073010, 129644790, 388934370, 477638700, 1432916100, 1767263190
(列表;图表;参考;听;历史;文本;内部格式)
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