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 | -9 |
| 2 | -9 |
| 3 | 1611 |
| 4 | 6471 |
| 5 | -1148589 |
| 6 | -9872289 |
| 7 | 1732196331 |
| 8 | 25810293591 |
| 9 | -4461906502269 |
| 10 | -102948316013169 |
| 11 | 17472999720383451 |
| 12 | 581452715402943111 |
| 13 | -96525920129033025549 |
| 14 | -4413961128482041139649 |