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1, 3, 13, 57, 249, 1087, 4745, 20713, 90417, 394691, 1722917, 7520929, 32830585, 143313055, 625594449, 2730863665, 11920848033, 52037243619, 227154537661, 991581805481, 4328482658041, 18894822411423, 82480245888473, 360045244866137, 1571680309076689, 6860746056673507
(列表;图表;参考;听;历史;文本;内部格式)
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