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 | -6 |
| 2 | -8 |
| 3 | 48 |
| 4 | 340 |
| 5 | 984 |
| 6 | -1148 |
| 7 | -34152 |
| 8 | -254780 |
| 9 | -1250376 |
| 10 | -3417788 |
| 11 | 12508248 |
| 12 | 296104900 |
| 13 | 3122953464 |
| 14 | 26485493572 |
| 15 | 201873508248 |
| 16 | 1443404093380 |
| 17 | 9892106472504 |
| 18 | 65798800964932 |
| 19 | 428187502981848 |
| 20 | 2740792716574660 |
| 21 | 17321987718906744 |
| 22 | 108394003491348292 |