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 | 1 |
| 2 | 5 |
| 3 | 81 |
| 4 | 4079 |
| 5 | 507549 |
| 6 | 127126912 |
| 7 | 55643064708 |
| 8 | 38715666455777 |
| 9 | 40095856807088486 |
| 10 | 58901884724160709571 |
| 11 | 118283825763578012358080 |
| 12 | 315297447553856723754810322 |
| 13 | 1089117884184737631305395668913 |
| 14 | 4778248300569771278502378511288513 |