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1, 1, 1, 2, 1, 5, 19, 65, 179, 567, 1971, 7188, 24104, 86560, 307758, 1093010, 3680499, 12984253, 44872804, 155894872, 524533909, 1798853267, 6095276268, 20640244000, 68424020576, 228663331673, 756885973017, 2497335148084, 8126657372315, 26483584838833, 85638964006761, 275736953129009
(列表;图表;参考文献;听;历史;文本;内部格式)
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