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| 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] |