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 | 4899999987 |
| 6 | 19899999972 |
| 7 | 28999899936 |
| 8 | 49989892689 |
| 9 | 49999917897 |
| 10 | 68899199886 |
| 11 | 68899199886 |
| 12 | 68899199886 |
| 13 | 2678052898989 |
| 14 | 17902896898419 |
| 15 | 137530987695297 |
| 16 | 189281899170567 |
| 17 | 368055404997498 |