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A081143 as a simple table

na(n)
00
10
20
31
420
5250
62500
721875
8175000
91312500
109375000
1164453125
12429687500
132792968750
1417773437500
15111083984375
16683593750000
174150390625000
1824902343750000
19147857666015625
20869750976562500
215073547363281250

[0,0,0,1,20,250,2500,21875,175000,1312500,9375000,
 64453125,429687500,2792968750,17773437500,
 111083984375,683593750000,4150390625000,
 24902343750000,147857666015625,869750976562500,
 5073547363281250]