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1, 1, 4, 13, 45, 174, 710, 2829, 11685, 49826, 212370, 908756, 3967406, 17428452, 76575883, 339309966, 1515297265, 6775762236, 30392803463, 137107357008, 620274107946, 2810115185408, 12773447145043, 58242082395214, 265937635904625, 1216485786889994, 5578551230005231, 25624367940626478
(列表;图表;参考;听;历史;文本;内部格式)
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