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1, 1, 3, 7, 20, 63, 232, 944, 4158, 19236, 91794, 446311, 2194569, 10863768, 53995350, 269013587, 1342192961, 6702368648, 33486112079, 167353481065, 836536395240, 4181989400979, 20907870188551, 104533122311131, 522646929294281, 2613178606952285
(列表;图表;参考文献;听;历史;文本;内部格式)
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