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 | 2 |
| 2 | 8 |
| 3 | 48 |
| 4 | 315 |
| 5 | 320 |
| 6 | 6664 |
| 7 | 135450 |
| 8 | 273000 |
| 9 | 518661 |
| 10 | 519440 |
| 11 | 519622 |
| 12 | 148830266 |
| 13 | 558797841 |
| 14 | 558797968 |
| 15 | 24900609294 |