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1, 1, 4, 6, 18, 42, 118, 314, 895, 2521, 7307, 21238, 62566, 185310, 553288, 1660490, 5011299, 15190665, 46244031, 141296042, 433204573, 1332261200, 4108833222, 12704949506, 39379343929, 122327632914, 380778749899, 1187544117426
(列表;图表;参考文献;听;历史;文本;内部格式)
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