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0, 1, 3, 12, 48, 195, 791, 3211, 13031, 52884, 214614, 870949, 3534489, 14343685, 58209627, 236226664, 958656488, 3890425619, 15788149015, 64071562799, 260015607607, 1055196927408, 4282206617710, 17378077058869, 70523818494625, 286200191092217, 1161459364079427, 4713441487441732, 19128117041912800
(列表;图表;参考;听;历史;文本;内部格式)
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