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1, 1, 4, 14, 57, 247, 1124, 5296, 25621, 126529, 635264, 3232886, 16638821, 86456767, 452927448, 2389672752, 12686560409, 67721774737, 363268546892, 1957131383342, 10585610149121, 57458399978455, 312890905815900, 1708883398754176, 9358483855106829, 51378142520487281, 282714583026982504
(列表;图表;参考;听;历史;文本;内部格式)
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