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1, 1, 2, 5, 15, 52, 207, 923, 4532, 24271, 140581, 874434, 5806557, 40955973, 305544958, 2402139329, 19837601155, 171598571288, 1550865447043, 14611295961047, 143210242799872, 1457573997373131, 15379106145570681, 167962044452359398, 1896100883094424657, 22096376018936592193
(列表;图表;参考;听;历史;文本;内部格式)
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