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A016855 as a simple table

na(n)
00
178125
210000000
3170859375
41280000000
56103515625
621870000000
764339296875
8163840000000
9373669453125
10781250000000
111522435234375
122799360000000
134902227890625
148235430000000
1513348388671875

[0,78125,10000000,170859375,1280000000,6103515625,
 21870000000,64339296875,163840000000,373669453125,
 781250000000,1522435234375,2799360000000,
 4902227890625,8235430000000,13348388671875]