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4, 21, 104, 507, 2452, 11808, 56732, 272229, 1305400, 6257355, 29988140, 143701056, 688563508, 3299237877, 15807943688, 75741312603, 362900797636, 1738768378464, 8330956025036, 39916050834885, 191249400483544, 916331219497131, 4390407398410844
(列表;图表;参考;听;历史;文本;内部格式)
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