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0, 1, 4, 21, 148, 1365, 15966, 229411, 3932440, 78438681, 1784386810, 45565679511, 1289796524820, 40065439945141, 1354630932486118, 49512390012682395, 1945119744809765296, 81728227537432878513, 3657019655412488345202, 173610723750748520091679
(列表;图表;参考;听;历史;文本;内部格式)
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