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 | -4 |
| 4 | 40 |
| 5 | -17570 |
| 6 | 29277 |
| 7 | 1612051490 |
| 8 | -98797189506 |
| 9 | 24519692392546611 |
| 10 | -1102715711997300050 |
| 11 | -4167252029989605007510429722 |
| 12 | -29479989614260596083347544 |
| 13 | 4174157347638693670019191622559426971168 |
| 14 | 139672908285735171626083209102943170111074 |