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1, 1, 1, 2, 4, 9, 20, 46, 105, 243, 556, 1269, 2873, 6486, 14555, 32556, 72517, 161032, 356396, 786610, 1731228, 3800671, 8323071, 18184612, 39640861, 86228722, 187177522, 405493600, 876728251, 1892008416, 4075471821, 8762948485
(列表;图表;参考;听;历史;文本;内部格式)
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