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 | 19 |
| 3 | 1513 |
| 4 | 315523 |
| 5 | 136085041 |
| 6 | 105261234643 |
| 7 | 132705221399353 |
| 8 | 254604707462013571 |
| 9 | 705927677520644167681 |
| 10 | 2716778010767155313771539 |
| 11 | 14050650308943101316593590153 |
| 12 | 95096065132610734223282520762883 |
| 13 | 823813936407337360148622860507620561 |