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267728元作为一个简单的表

n个a(n)
01
15
228
153
4685
52981
612145
749732
8198288
9794516
103183044
1112708912
1250791812
13203443136
14815107736
153266040800

[1,5,28,153,685,2981,12145,49732,198288,794516,3183044,12708912,50791812,203443136,815107736,3266040800]