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1, 2, 5, 14, 45, 164, 661, 2906, 13829, 70736, 386397, 2242118, 13759933, 88975628, 604202693, 4296191090, 31904681877, 246886692680, 1986631886029, 16592212576862, 143589971363981, 1285605080403332, 11891649654471285, 113491862722958474, 1116236691139398565
(列表;图表;参考;听;历史;文本;内部格式)
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