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0, 1, 1, 4, 9, 22, 54, 138, 346, 889, 2285, 5928, 15436, 40424, 106230, 280305, 741912, 1969816, 5243942, 13995807, 37439883, 100371907, 269623436, 725638613, 1956352468, 5283171593, 14289645110, 38707131195, 104995130162, 285184002486, 775586517781
(列表;图表;参考;听;历史;文本;内部格式)
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