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A049380 as a simple table

na(n)
01
110
2175
33500
474375
51636250
636815625
7841500000
819459687500
9454059375000
1010670395312500
11252209343750000
125989971914062500
13142837791796875000
143417904303710937500
1582029703289062500000

[1,10,175,3500,74375,1636250,36815625,841500000,
 19459687500,454059375000,10670395312500,
 252209343750000,5989971914062500,
 142837791796875000,3417904303710937500,
 82029703289062500000]