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1, 1, 2, 6, 21, 75, 267, 951, 3407, 12309, 44867, 164891, 610347, 2273020, 8508804, 31991549, 120734511, 457129176, 1735730619, 6607223257, 25207606841, 96365703918, 369070368271, 1415863217868, 5439991258764, 20930861647331, 80638367290921, 311043531047557, 1201127506963082
(列表;图表;参考;听;历史;文本;内部格式)
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