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 | -14 |
| 3 | -24 |
| 4 | 78 |
| 5 | 536 |
| 6 | 1236 |
| 7 | -308 |
| 8 | -12322 |
| 9 | -45218 |
| 10 | -73680 |
| 11 | 76144 |
| 12 | 872868 |
| 13 | 2833904 |
| 14 | 4612952 |
| 15 | -2467592 |
| 16 | -42205746 |
| 17 | -147191388 |
| 18 | -285572658 |
| 19 | -127256088 |
| 20 | 1376616024 |
| 21 | 6138841704 |
| 22 | 14949184532 |
| 23 | 19201535108 |
| 24 | -18287313476 |
| 25 | -186761626394 |
| 26 | -604980766280 |