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 | -336 |
| 2 | -114912 |
| 3 | 4151616 |
| 4 | 100931712 |
| 5 | -2848456800 |
| 6 | -37865826432 |
| 7 | 222362076288 |
| 8 | 7928555745600 |
| 9 | 86986313152368 |
| 10 | 620751040620480 |
| 11 | 3392046804500928 |
| 12 | 15293330001535488 |
| 13 | 59435665658243616 |
| 14 | 204976008706800384 |
| 15 | 640351567531186560 |
| 16 | 1840291945275505344 |
| 17 | 4923361835292283488 |