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-1, 0, 1, 6, 19, 53, 144, 384, 1010, 2652, 6960, 18271, 48007, 126292, 332679, 877561, 2318039, 6131032, 16236271, 43047375, 114256746, 303570609, 807327311, 2148933010, 5724699937, 15262109996, 40717942427, 108704057535, 290385838171, 776171229484
(列表;图表;参考文献;听;历史;文本;内部格式)
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