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 | 54 |
| 3 | 399 |
| 4 | 3249 |
| 5 | 27999 |
| 6 | 249999 |
| 7 | 2285713 |
| 8 | 21249999 |
| 9 | 199999999 |
| 10 | 1899999999 |
| 11 | 18181818180 |
| 12 | 174999999999 |
| 13 | 1692307692306 |
| 14 | 16428571428570 |
| 15 | 159999999999999 |
| 16 | 1562499999999999 |
| 17 | 15294117647058822 |
| 18 | 149999999999999999 |