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0, 1, 1, 3, 12, 64, 402, 2999, 25100, 236278, 2444779, 27725926, 340761474, 4522224643, 64378645709, 979609661544, 15862570817855, 272466359964053, 4948142926019039, 94748748685737418, 1907956061833749740, 40310880538563569017, 891655630401500129652, 20608302703021633063682
(列表;图表;参考文献;听;历史;文本;内部格式)
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