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A083835 as a simple table

n a(n)
1 1
2 9
3 99
4 121
5 131
6 999
7 9999
8 12021
9 12121
10 13031
11 13131
12 99999
13 999999
14 1202021
15 1203021
16 1212121
17 1213121
18 1302031
19 1303031
20 1312131
21 1313131
22 9999999
23 99999999
24 120202021
25 120212021
26 120303021
27 120313021
28 121202121
29 121212121

[1,9,99,121,131,999,9999,12021,12121,13031,13131,
 99999,999999,1202021,1203021,1212121,1213121,
 1302031,1303031,1312131,1313131,9999999,99999999,
 120202021,120212021,120303021,120313021,121202121,
 121212121]

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Last modified January 17 23:37 EST 2020. Contains 330995 sequences. (Running on oeis4.)