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A058421 as a simple table

n a(n)
1 1
2 9
3 109
4 901
5 1009
6 9001
7 10009
8 10401
9 90001
10 100009
11 100901
12 900001
13 1000009
14 1004001
15 8954391
16 9000001
17 10000009
18 10009001
19 34351141
20 90000001
21 100000009
22 100040001
23 900000001
24 1000000009
25 1000090001
26 3163554991
27 9000000001

[1,9,109,901,1009,9001,10009,10401,90001,100009,
 100901,900001,1000009,1004001,8954391,9000001,
 10000009,10009001,34351141,90000001,100000009,
 100040001,900000001,1000000009,1000090001,
 3163554991,9000000001]

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Last modified July 28 19:33 EDT 2021. Contains 346335 sequences. (Running on oeis4.)