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 | 8 |
| 2 | -15 |
| 3 | 212 |
| 4 | -865 |
| 5 | 31560 |
| 6 | -397285 |
| 7 | 8760472 |
| 8 | -73512810 |
| 9 | 7619823960 |
| 10 | -79612742055 |
| 11 | 11869626289356 |
| 12 | -148201090063455 |
| 13 | 2000757995572336 |
| 14 | -58073355854498985 |
| 15 | 15325818191986269968 |
| 16 | -253388757170439526636 |
| 17 | 84454267865884467099120 |
| 18 | -1566608640281391343515450 |
| 19 | 30637801046762651850275960 |