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1, 1, 3, 13, 51, 201, 813, 3333, 13779, 57361, 240153, 1010109, 4264989, 18066777, 76745763, 326796213, 1394494803, 5961639969, 25528971369, 109482236013, 470145451401, 2021360463849, 8700225608583, 37484437325157, 161647475666301, 697673760945201
(列表;图表;参考;听;历史;文本;内部格式)
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