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A198970 as a simple table

na(n)
03
139
2399
33999
439999
5399999
63999999
739999999
8399999999
93999999999
1039999999999
11399999999999
123999999999999
1339999999999999
14399999999999999
153999999999999999
1639999999999999999
17399999999999999999
183999999999999999999
1939999999999999999999
20399999999999999999999

[3,39,399,3999,39999,399999,3999999,39999999,
 399999999,3999999999,39999999999,399999999999,
 3999999999999,39999999999999,399999999999999,
 3999999999999999,39999999999999999,
 399999999999999999,3999999999999999999,
 39999999999999999999,399999999999999999999]