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1, 1, 2, 4, 13, 34, 111, 352, 1221, 4184, 15083, 55391, 205712, 779703, 2997654, 11661511, 45778491, 181783227, 728691627, 2937711675, 11944846339, 48899728232, 201293267995, 833025368003, 3467043404167, 14498558571508, 60864665286887, 256663357107545, 1086672027553058, 4615962185504438
(列表;图表;参考;听;历史;文本;内部格式)
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