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0, 0, 2, 4, 16, 36, 128, 440, 1706, 6560, 24576, 90046, 327680, 1197824, 4438966, 16645120, 62914560, 238609052, 905969664, 3442670796, 13102206738, 49977704448, 191126044672, 732649663000, 2814062572336, 10825960652800, 41705086880768, 160862475611574
(列表;图表;参考;听;历史;文本;内部格式)
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