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 | -46 |
| 3 | -292 |
| 4 | 6316 |
| 5 | 71032 |
| 6 | -1436936 |
| 7 | -24183472 |
| 8 | 454560656 |
| 9 | 10582510112 |
| 10 | -183387274976 |
| 11 | -5658029605952 |
| 12 | 89546942024896 |
| 13 | 3573911647620992 |
| 14 | -51057689020940416 |
| 15 | -2603853531376575232 |
| 16 | 33085559702952161536 |
| 17 | 2149253944507164508672 |