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 | 8 |
| 3 | 110 |
| 4 | 2262 |
| 5 | 63822 |
| 6 | 2335856 |
| 7 | 106643980 |
| 8 | 5901564892 |
| 9 | 387251339836 |
| 10 | 29612207398688 |
| 11 | 2601877956513640 |
| 12 | 259646660158526856 |
| 13 | 29140784853464966632 |
| 14 | 3647614440065070983488 |
| 15 | 505553321559685235600720 |
| 16 | 77096697572750991426551056 |
| 17 | 12864789849511242132008021520 |