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1, 1, 3, 11, 42, 169, 721, 3105, 13838, 62047, 283633, 1303734, 6061730, 28318686, 133282890, 629750099, 2990908792, 14249878475, 68148765938, 326757727504, 1571225170941, 7571392176951, 36566846891408, 176917128336520, 857500703098429, 4162433708763959, 20234912112599861, 98493026288524495
(列表;图表;参考;听;历史;文本;内部格式)
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