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 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | -18 |
| 4 | 378 |
| 5 | -5670 |
| 6 | 52488 |
| 7 | 930204 |
| 8 | -55108026 |
| 9 | 575622774 |
| 10 | 46483766460 |
| 11 | -1494416264796 |
| 12 | -85327731650772 |
| 13 | 5947844644410876 |
| 14 | 192190798316367540 |
| 15 | -29067440301002581416 |
| 16 | -418574641900663175706 |
| 17 | 179341053539746099078422 |