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1, 1, 2, 5, 14, 41, 130, 414, 1365, 4564, 15491, 53147, 184014, 641710, 2251113, 7937416, 28108741, 99903584, 356181450, 1273253851, 4561936460, 16377201916, 58894487282, 212108951615, 764910126587, 2761577715513, 9980164366260, 36099265669505, 130675238973018
(列表;图表;参考文献;听;历史;文本;内部格式)
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