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A261570 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 12345678911987654321
11 123456789112211987654321
12 1234567891122332211987654321
13 12345678911223344332211987654321
14 123456789112233445544332211987654321

[1,121,12321,1234321,123454321,12345654321,
 1234567654321,123456787654321,12345678987654321,
 12345678911987654321,123456789112211987654321,
 1234567891122332211987654321,
 12345678911223344332211987654321,
 123456789112233445544332211987654321]

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Last modified December 14 17:55 EST 2019. Contains 329979 sequences. (Running on oeis4.)