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1, 1, 1, 1, 2, 5, 11, 22, 45, 99, 226, 515, 1168, 2670, 6186, 14467, 33985, 80105, 189636, 451060, 1077225, 2580979, 6201602, 14942480, 36098349, 87417956, 212159347, 515937882, 1257048536, 3068146679, 7500995555, 18366760161, 45037590888, 110588510089
(列表;图表;参考;听;历史;文本;内部格式)
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