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3, 9, 36, 192, 1089, 6642, 42129, 275571, 1844028, 12567762, 86924745, 608612814, 4305284400, 30723593751, 220917003516, 1599013642359, 11641144003245, 85186969539435, 626245146267393, 4622806865390823, 34251800667936939, 254640579219212457
(列表;图表;参考;听;历史;文本;内部格式)
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