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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | -1 |
| 5 | -19 |
| 6 | -153 |
| 7 | -1155 |
| 8 | -9785 |
| 9 | -183075 |
| 10 | -25013497 |
| 11 | -11301739395 |
| 12 | -10911778097209 |
| 13 | -21604455470794723 |
| 14 | -86776403662147521913 |
| 15 | -702894028759616525605187 |
| 16 | -11441974451382622345470900921 |
| 17 | -373552937787342469475481963377571 |