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1, 1, 3, 8, 25, 80, 271, 952, 3443, 12758, 48212, 185283, 722227, 2849955, 11366379, 45757142, 185726603, 759401542, 3125472832, 12939604503, 53856950922, 225250407802, 946253665230, 3991221520996, 16897320866269, 71782331694315
(列表;图表;参考;听;历史;文本;内部格式)
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