This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 999 |
| 4 | 999999999 |
| 5 | 29799999792 |
| 6 | 39789998793 |
| 7 | 39989598993 |
| 8 | 68899199886 |
| 9 | 68899199886 |
| 10 | 68899199886 |
| 11 | 68899199886 |
| 12 | 68899199886 |
| 13 | 2699657569962 |
| 14 | 146189959981641 |
| 15 | 191388777883191 |
| 16 | 191388777883191 |
| 17 | 18641845754814681 |