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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 99 |
| 5 | 9307 |
| 6 | 3462205 |
| 7 | 401327263 |
| 8 | 5290639975663 |
| 9 | 21886143096656843 |
| 10 | 32306573547837099089161 |
| 11 | 2837034062676862693613762377 |
| 12 | 182184397885888753164448171682621 |