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1, 1, 2, 8, 37, 181, 1010, 6135, 40893, 295753, 2317683, 19568427, 177397551, 1719790643, 17767328745, 194954224643, 2265042428226, 27785727158182, 358952560098959, 4871697965709175, 69309502018430799, 1031550920679805502, 16030923441853969843, 259682356008358417321, 4377679648827121988375
(列表;图表;参考;听;历史;文本;内部格式)
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