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1, 4, 17, 81, 387, 1882, 9239, 45476, 225097, 1115850, 5543901, 27581511, 137343231, 684560964, 3413759073, 17033098407, 85017930387, 424482793264, 2119935547247, 10589260095977, 52903520205067, 264337253519526, 1320934285008687, 6601511476525466, 32994205139235397, 164914905473037574
(列表;图表;参考;听;历史;文本;内部格式)
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