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A198971 as a simple table

na(n)
04
149
2499
34999
449999
5499999
64999999
749999999
8499999999
94999999999
1049999999999
11499999999999
124999999999999
1349999999999999
14499999999999999
154999999999999999
1649999999999999999
17499999999999999999
184999999999999999999

[4,49,499,4999,49999,499999,4999999,49999999,
 499999999,4999999999,49999999999,499999999999,
 4999999999999,49999999999999,499999999999999,
 4999999999999999,49999999999999999,
 499999999999999999,4999999999999999999]