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1, 2, 6, 17, 48, 135, 379, 1063, 2980, 8352, 23405, 65584, 183769, 514919, 1442785, 4042614, 11327182, 31738101, 88928244, 249171491, 698163131, 1956209807, 5481178344, 15357920824, 43031938457, 120572813012, 337837515853, 946599685919, 2652313383105
(列表;图表;参考;听;历史;文本;内部格式)
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