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2, 1, 3, 10, 55, 311, 2446, 19447, 196337, 2014777, 24828706, 311108051, 4507990477, 66719239237, 1112079627842, 18945126606421, 356368711926481, 6867187345103057, 143985206958508162, 3092256807348721807, 71426909592196938101, 1691486262041519369581
(列表;图表;参考文献;听;历史;文本;内部格式)
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