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0, 0, 1, 1, 4, 16, 70, 385, 2365, 16337, 125870, 1064810, 9829820, 98319221, 1058927507, 12220050571, 150421002736, 1967299266676, 27243141998506, 398221614894397, 6127294825424317, 98992456408509257, 1675478215412320154, 29646991284088234166
(列表;图表;参考;听;历史;文本;内部格式)
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