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0, 2, 6, 12, 24, 40, 72, 126, 240, 468, 960, 2002, 4248, 9048, 19320, 41190, 87648, 185980, 393552, 830490, 1748040, 3670464, 7690056, 16078702, 33555024, 69905700, 145403232, 301990626, 626350200, 1297438888, 2684355480, 5547667062, 11453247168, 23622321228, 48676297200, 100215904810
(列表;图表;参考;听;历史;文本;内部格式)
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