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1, 6, 18, 48, 131, 363, 1017, 2873, 8169, 23349, 67024, 193086, 557949, 1616501, 4694034, 13657896, 39809649, 116218701, 339762942, 994553160, 2914608177, 8550424953, 25107964077, 73793368593, 217057617567, 638936722403, 1882096946232, 5547613247418
(列表;图表;参考;听;历史;文本;内部格式)
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