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1, 0, 1, 1, 3, 7, 16, 45, 110, 308, 819, 2275, 6328, 17748, 50388, 143412, 411939, 1187329, 3441559, 10015005, 29255655, 85766655, 252201690, 743819115, 2199446652, 6519727800, 19369551936, 57665571072, 172011364452, 514021640564, 1538650042952
(列表;图表;参考;听;历史;文本;内部格式)
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