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 | 1 |
| 2 | 3 |
| 3 | 24 |
| 4 | 624 |
| 5 | 58258 |
| 6 | 21423356 |
| 7 | 33352210384 |
| 8 | 234271975272172 |
| 9 | 7849205797114197704 |
| 10 | 1318509837007765330964948 |
| 11 | 1161589241831987552884873549832 |
| 12 | 5592410686612429649991093735982825800 |
| 13 | 152814054664056604403587836700924195641924920 |