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0, 0, 0, 0, 0, 1, 4, 12, 31, 75, 175, 399, 894, 1975, 4313, 9330, 20026, 42704, 90558, 191117, 401654, 841016, 1755249, 3652663, 7581369, 15698735, 32438224, 66897295, 137718495, 283056086, 580906268, 1190538424, 2436854280, 4982012329, 10174319500, 20756971236, 42306806495, 86153127395
(列表;图表;参考;听;历史;文本;内部格式)
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