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 | 0 |
| 1 | 1 |
| 2 | 26 |
| 3 | 2131 |
| 4 | 362164 |
| 5 | 105007621 |
| 6 | 5156362654 |
| 7 | 129102916279 |
| 8 | 108696708796264 |
| 9 | 13163623138673569 |
| 10 | 18033329053484721586 |
| 11 | 30330904507928806086691 |
| 12 | 30344915637965488890716 |
| 13 | 1487479897654682071525709 |