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1, 1, 1, 1, 2, 7, 23, 65, 167, 418, 1078, 2927, 8261, 23677, 67917, 194401, 557097, 1604805, 4655373, 13592002, 39875297, 117379888, 346445156, 1025077295, 3040774879, 9043131251, 26958950829, 80545589421, 241122613367, 723125785251, 2172271809579, 6535785964961, 19693769446456, 59425319779021, 179551868445081, 543187254954865, 1645200904479900
(列表;图表;参考;听;历史;文本;内部格式)
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