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1, 1, 2, 5, 14, 42, 132, 429, 1429, 4847, 16660, 57820, 202086, 709928, 2503266, 8850681, 31355020, 111242127, 395091069, 1404332528, 4994581900, 17771328588, 63253477326, 225194224134, 801884971816, 2855809269782, 10171707099565
(列表;图表;参考;听;历史;文本;内部格式)
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