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 | 1 |
| 3 | 3 |
| 4 | 15 |
| 5 | 199 |
| 6 | 6247 |
| 7 | 505623 |
| 8 | 105997283 |
| 9 | 58923059879 |
| 10 | 87882127554983 |
| 11 | 355824020816195749 |
| 12 | 3945677945542866439849 |
| 13 | 120747614641791880577007593 |
| 14 | 10263027079252827219477164325361 |
| 15 | 2436143827877272419846561427146618539 |
| 16 | 1622665432590314350761059585434700996826279 |