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 | 1 |
| 2 | -1 |
| 3 | -8 |
| 4 | -3 |
| 5 | 516 |
| 6 | 235 |
| 7 | -336258 |
| 8 | -3909367 |
| 9 | 1462013704 |
| 10 | 28386802071 |
| 11 | -43272301150110 |
| 12 | -3999150112115411 |
| 13 | 7064064858964289580 |
| 14 | 1224799123758409303091 |
| 15 | -6776368902478388538739274 |
| 16 | -3903339581644484604889375215 |
| 17 | 32981625415507385681195122476432 |