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1, 2, 9, 37, 169, 764, 3570, 16703, 79241, 376798, 1805142, 8665465, 41789096, 201875936, 978179193, 4746784129, 23083338726, 112396493348, 548133058539, 2676039172518, 13080534402875, 63997396326343, 313416940914396, 1536133931051434, 7535038583429033, 36986339951436139, 181673837189597527
(列表;图表;参考;听;历史;文本;内部格式)
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