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1, 0, 1, 1, 2, 2, 5, 6, 15, 28, 67, 145, 368, 870, 2211, 5549, 14290, 36824, 96347, 252927, 670142, 1783770, 4777951, 12855392, 34756783, 94345664, 257114389, 703150507, 1929404736, 5310364234, 14658134277, 40569137070, 112566363319, 313074271844, 872677323283
(列表;图表;参考;听;历史;文本;内部格式)
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