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1, 1, 2, 4, 12, 31, 90, 264, 797, 2402, 7355, 22725, 70573, 220007, 688379, 2160568, 6798020, 21428295, 67644503, 213806475, 676499166, 2142338437, 6789119425, 21527297986, 68292751071, 216737768906, 688082702872, 2185085230180, 6940609839680, 22050162168754
(列表;图表;参考;听;历史;文本;内部格式)
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