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1, 2, 15, 42, 421, 1331, 15119, 618765, 2155578, 98032875, 1290154807, 4682196239, 63117678751, 3186252107917, 164886529617695, 616630679090258, 32763760653353135, 467443761039641135, 1768227793278781667, 96699391743949360451, 1402535447576150395335
(列表;图表;参考;听;历史;文本;内部格式)
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