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1, 6, 40, 200, 1056, 4928, 23808, 107136, 494080, 2173952, 9744384, 42225664, 185679872, 795770880, 3451518976, 14668955648, 62970789888, 265876668416, 1132226150400, 4755349831680, 20120910954496, 84141991264256, 354160151101440, 1475667296256000, 6184144161734656
(列表;图表;参考;听;历史;文本;内部格式)
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