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1, 2, 7, 20, 60, 176, 518, 1520, 4461, 13090, 38423, 112828, 331487, 974442, 2866125, 8434992, 24838275, 73181142, 215729781, 636275820, 1877569134, 5543095404, 16372140876, 48377825216, 143009973875, 422918975726, 1251154692297
(列表;图表;参考;听;历史;文本;内部格式)
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