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1, 4, 17, 72, 306, 1304, 5573, 23888, 102702, 442904, 1915978, 8314480, 36195236, 158067312, 692475053, 3043191200, 13415404246, 59321085720, 263100680926, 1170347803440, 5221037429948, 23356788588752, 104772374565666, 471214329434208, 2124649562373708, 9603094073668208
(列表;图表;参考;听;历史;文本;内部格式)
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