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1, 1, 1, 4, 17, 51, 142, 442, 1457, 4702, 14951, 48038, 156158, 508860, 1658112, 5414754, 17735473, 58209803, 191310964, 629605300, 2074916167, 6846553375, 22615507300, 74775856026, 247463508542, 819645776926, 2716912851446, 9012261102106, 29914317146864
(列表;图表;参考;听;历史;文本;内部格式)
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