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A170955 as a simple table

na(n)
11
291
3991
49991
599991
6999991
79999991
899999991
9999999991
109999999991
1199999999991
12999999999991
139999999999991
1499999999999991
15999999999999991
169999999999999991
1799999999999999991
18999999999999999991
199999999999999999991
2099999999999999999991
21999999999999999999991

[1,91,991,9991,99991,999991,9999991,99999991,
 999999991,9999999991,99999999991,999999999991,
 9999999999991,99999999999991,999999999999991,
 9999999999999991,99999999999999991,
 999999999999999991,9999999999999999991,
 99999999999999999991,999999999999999999991]