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 | 2 |
| 2 | -4 |
| 3 | -24 |
| 4 | -16 |
| 5 | 160 |
| 6 | 448 |
| 7 | -384 |
| 8 | -4352 |
| 9 | -5632 |
| 10 | 23552 |
| 11 | 92160 |
| 12 | -4096 |
| 13 | -745472 |
| 14 | -1458176 |
| 15 | 3047424 |
| 16 | 17760256 |
| 17 | 11141120 |
| 18 | -119799808 |
| 19 | -328728576 |
| 20 | 300941312 |
| 21 | 3231711232 |
| 22 | 4055891968 |
| 23 | -17741905920 |
| 24 | -67930947584 |