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1, 1, 2, 7, 36, 252, 2278, 25479, 343318, 5455963, 100504720, 2117265242, 50438185262, 1345840435641, 39899564488618, 1305139816260887, 46817884128344164, 1831903983379048308, 77815287718736660334, 3573159363560866942735, 176687138080525842904446, 9376097634171921557906827
(列表;图表;参考;听;历史;文本;内部格式)
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