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 | 15 |
| 3 | 1231 |
| 4 | 19615 |
| 5 | 12280111 |
| 6 | 4090037 |
| 7 | 9824498837 |
| 8 | 157151464517 |
| 9 | 38193952437631 |
| 10 | 7637983935923 |
| 11 | 111835788321880643 |
| 12 | 111830093529238643 |
| 13 | 3194097388508809394723 |
| 14 | 3194009594644356242723 |
| 15 | 15970381078317764649391 |