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1, 1, 1, 2, 5, 12, 31, 84, 250, 762, 2504, 8358, 28928, 101339, 361184, 1297864, 4707712, 17179434, 63068079, 232615770, 861723271, 3204236692, 11955827898, 44748176652, 167959114814, 632058070297, 2384234976235, 9013628450510
(列表;图表;参考;听;历史;文本;内部格式)
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