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1, 1, 3, 8, 26, 86, 309, 1112, 4300, 16355, 64610, 258460, 1049577, 4289188, 17767640, 74236553, 312798334, 1323001687, 5645624363, 24239460347, 104391408045, 451959306066, 1967440956925, 8589297566724, 37631972874233, 165505946315394, 730191658379518, 3230280805363359, 14327178302247607
(列表;图表;参考;听;历史;文本;内部格式)
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