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0, 1, 6, 31, 160, 841, 4494, 24319, 132864, 731281, 4048726, 22523359, 125797984, 704966809, 3961924126, 22321190911, 126027618304, 712917362209, 4039658528934, 22924714957471, 130271906898720, 741188107113961, 4221707080583086, 24070622500965631, 137369104574280960, 784622537295845041
(列表;图表;参考文献;听;历史;文本;内部格式)
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