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1, 1, 2, 2, 6, 8, 18, 30, 57, 103, 194, 360, 682, 1292, 2464, 4721, 9078, 17481, 33808, 65485, 127116, 247179, 481426, 938950, 1833572, 3584679, 7015237, 13741715, 26940645, 52858250, 103785060, 203913141, 400891200, 788601863, 1552114600
(列表;图表;参考;听;历史;文本;内部格式)
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