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1, 1, 2, 6, 24, 118, 644, 3622, 20366, 113686, 630464, 3481084, 19171838, 105444400, 579547826, 3184321642, 17493771830, 96100287256, 527905628552, 2899911094078, 15929870658308, 87506389326742, 480692570563526, 2640554790693958, 14505177373598504
(列表;图表;参考;听;历史;文本;内部格式)
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