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1, 1, 1, 3, 5, 11, 24, 52, 119, 272, 635, 1499, 3577, 8614, 20903, 51076, 125565, 310302, 770536, 1921440, 4809851, 12081986, 30445041, 76938794, 194950040, 495174037, 1260576786, 3215772264, 8219437433, 21046602265, 53982543827, 138678541693, 356785641107
(列表;图表;参考;听;历史;文本;内部格式)
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