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1, 1, 1, 2, 5, 14, 43, 140, 478, 1695, 6205, 23356, 90135, 355960, 1436755, 5922799, 24929035, 107136291, 470281976, 2109608447, 9677546281, 45434467501, 218478232454, 1076855324959, 5443845581547, 28239060235110, 150346623540441, 821555490484095
(列表;图表;参考;听;历史;文本;内部格式)
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