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1, 1, 2, 6, 30, 150, 900, 6300, 56700, 550620, 5506200, 60568200, 782951400, 10351341000, 144918774000, 2173781610000, 38080340298000, 653540914026000, 12158944705908000, 231019949412252000, 4855314209005260000, 102626845031971260000, 2275136280946849320000, 52328134461777534360000
(列表;图表;参考;听;历史;文本;内部格式)
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