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 | 12 |
| 3 | 255 |
| 4 | 11326 |
| 5 | 1136709 |
| 6 | 272246616 |
| 7 | 162043308555 |
| 8 | 246976754748242 |
| 9 | 985451332639242321 |
| 10 | 10465989453804481920460 |
| 11 | 299684548041297413533699479 |
| 12 | 23373481327888949572209959486022 |
| 13 | 5007060652963472122780384849366677469 |