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1, 1, 2, 6, 18, 90, 414, 2892, 18342, 155124, 1265130, 13413240, 129656286, 1564538796, 18285385518, 255345207156, 3378398348214, 52931303772912, 797460543143154, 13926097774972152, 234050020177159926, 4466082284967035124, 83159771376289666806
(列表;图表;参考;听;历史;文本;内部格式)
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