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1, 1, 1, 2, 4, 9, 22, 57, 154, 430, 1234, 3625, 10865, 33136, 102598, 321913, 1021963, 3278543, 10617413, 34678693, 114151769, 378436049, 1262822229, 4239469076, 14312153289, 48567846377, 165610404277, 567259571451, 1951218773118, 6738242931451, 23356148951482
(列表;图表;参考;听;历史;文本;内部格式)
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