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2, 12, 40, 144, 550, 1896, 7584, 27328, 105348, 398760, 1538696, 5872800, 22646862, 87492676, 339055650, 1313842904, 5104724558, 19873572892, 77470783406, 302258087616, 1180840902336, 4618922848536, 18083348822516, 70852652846320
(列表;图表;参考;听;历史;文本;内部格式)
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