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1, 4, 18, 84, 394, 1836, 8468, 38632, 174426, 780156, 3460156, 15232344, 66613828, 289609144, 1252537704, 5391904208, 23114020090, 98712408732, 420134237996, 1782630641656, 7542431851692, 31830492787880, 134013965210008, 563006802201264, 2360517093477284
(列表;图表;参考;听;历史;文本;内部格式)
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