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0, 1, 0, 1, 1, 2, 3, 7, 11, 26, 52, 120, 266, 640, 1509, 3702, 9090, 22781, 57452, 146783, 377357, 978342, 2550611, 6690242, 17633855, 46705333, 124227015, 331757697, 889207207, 2391478247, 6451880415, 17457214729, 47363110968
(列表;图表;参考;听;历史;文本;内部格式)
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