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1, 1, 2, 4, 12, 30, 99, 293, 1044, 3407, 12855, 44919, 176474, 649372, 2629712, 10070299, 41769656, 165069542, 698089371, 2829957804, 12160768699, 50345664661, 219252800095, 923848427883, 4069175264385, 17404407118104, 77409162199404, 335367168975910, 1504255075382674, 6589914030388130
(列表;图表;参考文献;听;历史;文本;内部格式)
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