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1, 1, 0, 0, 2, 2, 3, 19, 42, 82, 280, 768, 1807, 5167, 14713, 38361, 105722, 299954, 821480, 2272736, 6422244, 17979356, 50311418, 142328594, 402652059, 1137986155, 3232284414, 9201271726, 26196062383, 74759129271, 213809119056
(列表;图表;参考;听;历史;文本;内部格式)
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