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1, 0, 0, 1, 3, 13, 50, 230, 1110, 5787, 32335, 191950, 1206247, 7997702, 55733468, 406952888, 3105706421, 24710573792, 204547052598, 1758110677909, 15663244043627, 144412976181189, 1375896762258868, 13528184875421816, 137098357090429007, 1430440534060723253
(列表;图表;参考;听;历史;文本;内部格式)
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