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A020699 as a simple table

na(n)
01
12
210
350
4250
51250
66250
731250
8156250
9781250
103906250
1119531250
1297656250
13488281250
142441406250
1512207031250
1661035156250
17305175781250
181525878906250
197629394531250
2038146972656250
21190734863281250
22953674316406250

[1,2,10,50,250,1250,6250,31250,156250,781250,
 3906250,19531250,97656250,488281250,2441406250,
 12207031250,61035156250,305175781250,
 1525878906250,7629394531250,38146972656250,
 190734863281250,953674316406250]