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 | 1 |
| 3 | 9 |
| 4 | 99 |
| 5 | 2862 |
| 6 | 188603 |
| 7 | 28338246 |
| 8 | 10179007465 |
| 9 | 8440119388684 |
| 10 | 16385876855589022 |
| 11 | 74005549246712939357 |
| 12 | 780142920501811666245635 |