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1, 2, 7, 24, 96, 390, 1640, 7003, 30629, 135960, 610766, 2762496, 12597678, 57882821, 267706394, 1243964373, 5803343475, 27181577787, 127811261317, 602994481450, 2852581142432, 13527290314262, 64302155624496, 306367818206171, 1462679856613386, 6995553173184415, 33511988966326965, 160793288870253855
(列表;图表;参考文献;听;历史;文本;内部格式)
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