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2, 8, 26, 106, 442, 1849, 7723, 32176, 133706, 554269, 2292655, 9464547, 39002251, 160466401, 659249461, 2704861756, 11084629546, 45375676501, 185562634951, 758155908511, 3094982778031, 12624593782321, 51458942047501, 209609423940151, 853271593454827
(列表;图表;参考;听;历史;文本;内部格式)
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