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0, 1, 4, 20, 128, 1024, 9984, 115968, 1572864, 24477696, 430571520, 8452177920, 183175741440, 4343275192320, 111817607086080, 3105593229312000, 92539365359616000, 2944365169213440000, 99619235621240832000, 3571109329517936640000, 135199252993504444416000, 5390266968989421797376000
(列表;图表;参考;听;历史;文本;内部格式)
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