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) |
|---|---|
| 1 | 9 |
| 2 | 49 |
| 3 | 289 |
| 4 | 6889 |
| 5 | 97969 |
| 6 | 698896 |
| 7 | 9696996 |
| 8 | 79869969 |
| 9 | 876988996 |
| 10 | 8998988769 |
| 11 | 88998998929 |
| 12 | 975979998889 |
| 13 | 9998768898889 |
| 14 | 97888999968769 |
| 15 | 898999897988929 |
| 16 | 9895699989899689 |
| 17 | 38999699989995889 |
| 18 | 989879999979599689 |