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 | 1 |
| 3 | -1 |
| 4 | -2 |
| 5 | -7 |
| 6 | -51 |
| 7 | -342 |
| 8 | -3165 |
| 9 | -34781 |
| 10 | -465842 |
| 11 | -7428379 |
| 12 | -139065247 |
| 13 | -3014260732 |
| 14 | -74720908617 |
| 15 | -2095541497991 |
| 16 | -65859561109214 |
| 17 | -2300344376478515 |