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1, 1, 2, 3, 9, 16, 35, 65, 250, 495, 1209, 2412, 6510, 13707, 32467, 68285, 176843, 387518, 926118, 2022259, 4928293, 11009067, 25938745, 57797488, 137808762, 311753120, 730878789, 1651849769, 3880235364, 8842052707, 20602970440, 46930887843, 109406749213
(列表;图表;参考;听;历史;文本;内部格式)
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