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 | 3969 |
| 3 | 29929 |
| 4 | 1999396 |
| 5 | 299739969 |
| 6 | 2909199969 |
| 7 | 19299599929 |
| 8 | 909995799969 |
| 9 | 9499999990849 |
| 10 | 999999202999696 |
| 11 | 9969959993997969 |
| 12 | 90949999999997329 |
| 13 | 9199999971969929929 |
| 14 | 199999969997999200969 |
| 15 | 19997911999199999979409 |
| 16 | 295191999919994299999969 |