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1, 2, 2, 6, 40, 208, 798, 3122, 15038, 77830, 381798, 1819998, 8925172, 45280900, 231030138, 1171823534, 5962836408, 30668699312, 158951012362, 825830001086, 4298605879552, 22459588992656, 117842770179898, 620193719988230, 3271151667546526, 17291851589803030, 91629268113394082, 486633483668452306, 2589396122840425628, 13802082307489152876, 73692343820697785462, 394098991084750746722
(列表;图表;参考;听;历史;文本;内部格式)
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