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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 11 |
| 3 | 37 |
| 4 | 101 |
| 5 | 9091 |
| 6 | 9901 |
| 7 | 333667 |
| 8 | 909091 |
| 9 | 99990001 |
| 10 | 999999000001 |
| 11 | 9999999900000001 |
| 12 | 909090909090909091 |
| 13 | 1111111111111111111 |
| 14 | 11111111111111111111111 |
| 15 | 900900900900990990990991 |
| 16 | 909090909090909090909090909091 |
[3,11,37,101,9091,9901,333667,909091,99990001, 999999000001,9999999900000001,909090909090909091, 1111111111111111111,11111111111111111111111, 900900900900990990990991, 909090909090909090909090909091] |