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1, 2, 5, 20, 77, 306, 1209, 4656, 17713, 66618, 248025, 916020, 3359789, 12250026, 44435997, 160466304, 577185745, 2068826290, 7392167585, 26338879556, 93609302941, 331924381218, 1174482354493, 4147807582672, 14622567051025, 51466158436298, 180869949252245, 634753692067716
(列表;图表;参考;听;历史;文本;内部格式)
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