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A261138 as a simple table

n a(n)
1 11
2 1221
3 123321
4 12344321
5 1234554321
6 123456654321
7 12345677654321
8 1234567887654321
9 123456789987654321
10 1234567891001987654321
11 12345678910111101987654321
12 123456789101112211101987654321
13 1234567891011121331211101987654321
14 12345678910111213144131211101987654321

[11,1221,123321,12344321,1234554321,123456654321,
 12345677654321,1234567887654321,
 123456789987654321,1234567891001987654321,
 12345678910111101987654321,
 123456789101112211101987654321,
 1234567891011121331211101987654321,
 12345678910111213144131211101987654321]

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Last modified April 23 02:53 EDT 2024. Contains 371906 sequences. (Running on oeis4.)