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1, 3, 9, 24, 70, 200, 576, 1662, 4793, 13824, 39876, 115021, 331776, 957008, 2760488, 7962624, 22968183, 66251702, 191102976, 551236371, 1590040836, 4586471424, 13229672881, 38160980056, 110075314176, 317512149144, 915863521340, 2641807540224, 7620291579446
(列表;图表;参考;听;历史;文本;内部格式)
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