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 | 99 |
| 3 | 792 |
| 4 | 3829608 |
| 5 | 255816 |
| 6 | 24814152 |
| 7 | 198513216 |
| 8 | 1588105728 |
| 9 | 669982104 |
| 10 | 5359856832 |
| 11 | 42878854656 |
| 12 | 7133969443392 |
| 13 | 57071755547136 |