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1, 4, 48, 320, 1610, 6012, 17948, 45488, 101970, 207920, 393272, 699888, 1184378, 1921220, 3006180, 4560032, 6732578, 9706968, 13704320, 18988640, 25872042, 34720268, 45958508, 60077520, 77640050, 99287552, 125747208, 157839248, 196484570, 242712660
(列表;图表;参考;听;历史;文本;内部格式)
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