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A173426 as a simple table

n a(n)
1 1
2 121
3 12321
4 1234321
5 123454321
6 12345654321
7 1234567654321
8 123456787654321
9 12345678987654321
10 12345678910987654321
11 123456789101110987654321
12 1234567891011121110987654321
13 12345678910111213121110987654321
14 123456789101112131413121110987654321 

[1,121,12321,1234321,123454321,12345654321,
 1234567654321,123456787654321,12345678987654321,
 12345678910987654321,123456789101110987654321,
 1234567891011121110987654321,
 12345678910111213121110987654321,
 123456789101112131413121110987654321]

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Last modified April 24 14:32 EDT 2024. Contains 371960 sequences. (Running on oeis4.)