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1, 0, 2, 2, 6, 24, 44, 136, 298, 914, 2462, 6464, 17740, 47840, 133618, 366162, 1011190, 2801144, 7775916, 21680712, 60443514, 168963010, 472975278, 1326349568, 3725180524, 10475012672, 29494512354, 83141905570, 234634612198, 662840458840, 1874315939756
(列表;图表;参考;听;历史;文本;内部格式)
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