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1, 5, 21, 77, 277, 1005, 3669, 13421, 49109, 179693, 657493, 2405741, 8802517, 32208109, 117848405, 431203437, 1577759189, 5772968941, 21123103317, 77288739693, 282796954325, 1034744746733, 3786096966485, 13853204169325, 50688418034645, 185467253023213, 678618573585493, 2483043021926765
(列表;图表;参考;听;历史;文本;内部格式)
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