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1, 3, 15, 84, 491, 2948, 18018, 111520, 696739, 4384668, 27753110, 176494640, 1126809230, 7217773800, 46364184420, 298554038144, 1926593569059, 12455864623020, 80664529969422, 523165672201744, 3397648036150426, 22092460470618328, 143809661629562460
(列表;图表;参考;听;历史;文本;内部格式)
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