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0, 1, 4, 18, 84, 387, 1784, 8228, 37944, 174981, 806940, 3721270, 17160940, 79139079, 364956336, 1683025992, 7761412016, 35792386313, 165059516916, 761185462362, 3510269016516, 16187892672139, 74651791054120, 344262840164460, 1587596244438120
(列表;图表;参考;听;历史;文本;内部格式)
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