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1, 1, 3, 12, 64, 402, 2972, 24884, 233224, 2413402, 27321706, 335811420, 4453678055, 63403359154, 964550068984, 15618677100569, 268256266076840, 4871672594496080, 93282009271337370, 1878417037286803586, 39686436905680824542, 877842387051165865980
(列表;图表;参考;听;历史;文本;内部格式)
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