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1, 1, 4, 21, 131, 921, 7083, 58493, 512342, 4718671, 45407919, 454384447, 4710818128, 50453504549, 556929098189, 6324139809301, 73759635547026, 882440215196461, 10817350790774790, 135741743078330321, 1742225569514045719, 22854838454769204603, 306233932315912508708, 4188667660550945874199, 58453992283916684321847, 831867972069915069340899
(列表;图表;参考;听;历史;文本;内部格式)
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