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A016853 as a simple table

na(n)
00
13125
2100000
3759375
43200000
59765625
624300000
752521875
8102400000
9184528125
10312500000
11503284375
12777600000
131160290625
141680700000
152373046875
163276800000
174437053125
185904900000
197737809375
2010000000000
2112762815625
2216105100000
2320113571875
2424883200000

[0,3125,100000,759375,3200000,9765625,24300000,
 52521875,102400000,184528125,312500000,503284375,
 777600000,1160290625,1680700000,2373046875,
 3276800000,4437053125,5904900000,7737809375,
 10000000000,12762815625,16105100000,20113571875,
 24883200000]