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0, 0, 0, 1, 0, 5, 4, 23, 36, 123, 252, 720, 1664, 4427, 10804, 27971, 69972, 179469, 454300, 1162529, 2961056, 7579620, 19376728, 49659406, 127263208, 326610827, 838550920, 2154985059, 5540935616, 14257159799, 36703613556, 94544579575
(列表;图表;参考;听;历史;文本;内部格式)
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