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1, 2, 6, 21, 79, 309, 1253, 5199, 21953, 94078, 407603, 1782008, 7852152, 34826220, 155346976, 696396185, 3135324925, 14170200056, 64262626325, 292332241071, 1333529156881, 6098477626368, 27953506288502, 128399740959616, 590923668118531, 2724414394446939, 12581474056408749, 58190854507105448
(列表;图表;参考;听;历史;文本;内部格式)
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