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0, 1, 2, 7, 28, 131, 690, 4033, 25864, 180265, 1354458, 10898823, 93407828, 848739867, 8143768538, 82229315137, 871067808272, 9654457636241, 111688595475634, 1345725966256071, 16854833617813388, 219050429104638707, 2949276326665620482, 41076923039499915393
(列表;图表;参考;听;历史;文本;内部格式)
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