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1, 1, 2, 6, 20, 68, 231, 781, 2629, 8821, 29530, 98706, 329592, 1099792, 3668127, 12230505, 40771337, 135895689, 452914658, 1509385902, 5029980252, 16761785436, 55855539047, 186125915029, 620217261197, 2066704787645, 6886704234970, 22947920663130, 76467083518464
(列表;图表;参考;听;历史;文本;内部格式)
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