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1, 1, 4, 11, 42, 132, 512, 1737, 6772, 23922, 93618, 339030, 1330402, 4898974, 19264646, 71788549, 282770996, 1063149998, 4193389956, 15875202814, 62687736884, 238629003248, 943200410068, 3606546108418, 14266939843816, 54756695145968, 216764481087652, 834569354875476, 3305876625351364
(列表;图表;参考;听;历史;文本;内部格式)
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