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 | 3 |
| 3 | 29 |
| 4 | 831 |
| 5 | 69107 |
| 6 | 16944055 |
| 7 | 12387543565 |
| 8 | 27116679815367 |
| 9 | 177967005474840987 |
| 10 | 3503280999913078429261 |
| 11 | 206872249547698485286567247 |
| 12 | 36647212198301159763279385189667 |