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 | 1 |
| 1 | 5 |
| 2 | 45 |
| 3 | 635 |
| 4 | 12815 |
| 5 | 343815 |
| 6 | 11651427 |
| 7 | 480718723 |
| 8 | 23489845779 |
| 9 | 1330745268401 |
| 10 | 85944092769721 |
| 11 | 6242138253088466 |
| 12 | 504185328302302736 |
| 13 | 44867722807185829082 |
| 14 | 4364538423763543903228 |
| 15 | 460969199012824227856506 |