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1, 2, 8, 39, 211, 1218, 7349, 45790, 292361, 1902834, 12577737, 84205212, 569788192, 3890728052, 26775751320, 185525538183, 1293171205833, 9061500578178, 63794947215218, 451028012126797, 3200898741338041, 22794860112273294, 162841330273522907
(列表;图表;参考;听;历史;文本;内部格式)
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