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1, 3, 15, 81, 422, 2124, 10223, 47813, 218130, 977354, 4315130, 18833538, 81424236, 349303352, 1488748719, 6310303727, 26621551418, 111854042306, 468309841090, 1954642186302, 8136002036672, 33782928166668, 139971138117190, 578803145957026
(列表;图表;参考;听;历史;文本;内部格式)
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