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1, 1, 2, 6, 19, 68, 236, 863, 3137, 11636, 43306, 162728, 614142, 2330454, 8875656, 33924699, 130038017, 499753560, 1924912505, 7429159770, 28723877046, 111236422377, 431403469046, 1675316533812, 6513837677642, 25354842098354, 98794053266471, 385312558567775
(列表;图表;参考;听;历史;文本;内部格式)
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