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 | 2 |
| 2 | 23 |
| 3 | 684 |
| 4 | 34760 |
| 5 | 2493096 |
| 6 | 228253267 |
| 7 | 25091028820 |
| 8 | 3179942075960 |
| 9 | 451649016238160 |
| 10 | 70421753109861592 |
| 11 | 11869050034269797984 |
| 12 | 2136758627313217104448 |