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1, 1, 2, 8, 26, 56, 194, 832, 2866, 7904, 30690, 137000, 497706, 1491512, 6041602, 27557184, 102985186, 321675648, 1333006018, 6160815624, 23426000186, 75016874488, 315357132994, 1470462300160, 5656904907026, 18419315779552, 78201118018466, 366962271138472
(列表;图表;参考;听;历史;文本;内部格式)
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