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1, 1, 1, 2, 4, 9, 20, 47, 108, 252, 582, 1345, 3086, 7072, 16121, 36667, 83099, 187885, 423610, 953033, 2139158, 4792126, 10714105, 23911794, 53273599, 118497834, 263164833, 583582570, 1292276355, 2857691087, 6311058671, 13919982308, 30664998056, 67473574130
(列表;图表;参考;听;历史;文本;内部格式)
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