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 | 4 |
| 3 | -76 |
| 4 | 7124 |
| 5 | -3326876 |
| 6 | 7760553124 |
| 7 | -90490361296876 |
| 8 | 5275336666748203124 |
| 9 | -1537656615631182860546876 |
| 10 | 2240970675863910673065189453124 |
| 11 | -16329855533286908545970966339091796876 |
| 12 | 594974481262862479448134839533519744970703124 |