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1, 4, 84, 2920, 121940, 5607504, 273908712, 13947188112, 732102614100, 39332168075200, 2152235533317584, 119531412173662944, 6720552415489860584, 381775182057562837600, 21879043278489630349200, 1263402662473729731877920, 73438613319490294002441300, 4293679728171938162242298400
(列表;图表;参考;听;历史;文本;内部格式)
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