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1, 7, 41, 245, 1476, 8897, 53621, 323155, 1947541, 11737152, 70735741, 426299755, 2569160621, 15483439097, 93313311876, 562366934045, 3389190268241, 20425473083407, 123097234932601, 741864297888000, 4470958562003401, 26944915020252607, 162387648058027841, 978653976900562445
(列表;图表;参考;听;历史;文本;内部格式)
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