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1, 1, 2, 5, 16, 52, 183, 664, 2449, 9362, 36633, 145270, 586439, 2398743, 9905045, 41348528, 174110004, 738361192, 3154440182, 13559465468, 58601967026, 254620276210, 1111404780914, 4871741807378, 21440930894794, 94702771111481, 419700986590893, 1865899431263205, 8319362447227408
(列表;图表;参考;听;历史;文本;内部格式)
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