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A081135 as a simple table

na(n)
00
10
21
315
4150
51250
69375
765625
8437500
92812500
1017578125
11107421875
12644531250
133808593750
1422216796875
15128173828125
16732421875000
174150390625000
1823345947265625
19130462646484375
20724792480468750

[0,0,1,15,150,1250,9375,65625,437500,2812500,
 17578125,107421875,644531250,3808593750,
 22216796875,128173828125,732421875000,
 4150390625000,23345947265625,130462646484375,
 724792480468750]