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1, 1, 1, 4, 21, 116, 713, 5030, 40301, 362852, 3628744, 39916716, 479001426, 6227020536, 87178290639, 1307674367142, 20922789886141, 355687428093140, 6402373705721708, 121645100408822276, 2432902008176618342, 51090942171709406408, 1124000727777607604418
(列表;图表;参考;听;历史;文本;内部格式)
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