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1, 1, 3, 8, 19, 52, 140, 479, 1464, 5596, 19334, 78841, 305406, 1295435, 5527265, 24403208, 112338932, 517908324, 2531226446, 12216601247, 62626424572, 316570510625, 1688123202118, 8924364770995, 49245542104325, 271541015196694, 1545740618597036
(列表;图表;参考;听;历史;文本;内部格式)
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