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1, 19, 51, 201, 723, 2709, 10161, 38459, 146297, 559135, 2145021, 8255579, 31861021, 123256499, 477823891, 1855782329, 7219352971, 28125910829, 109720617991, 428537256449, 1675561707271, 6557869020329, 25689734662771, 100720871774981, 395197661173123
(列表;图表;参考;听;历史;文本;内部格式)
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