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1, 1, 1, 1, 1, 2, 6, 16, 36, 71, 131, 247, 511, 1156, 2696, 6172, 13664, 29563, 63871, 140341, 315185, 717962, 1639822, 3728276, 8432696, 19047924, 43166420, 98378502, 225355290, 517683270, 1190034046, 2735049866, 6287002806, 14467864356, 33355524916
(列表;图表;参考;听;历史;文本;内部格式)
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