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2, 4, 8, 15, 42, 127, 376, 1122, 3344, 9980, 29796, 89007, 265986, 795147, 2377744, 7112065, 21277698, 63670773, 190560180, 570416805, 1707707142, 5113158165, 15311384784, 45854766744, 137339426436, 411379964442, 1232324471060
(列表;图表;参考;听;历史;文本;内部格式)
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