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 | -109 |
| 4 | 13436 |
| 5 | 8425506 |
| 6 | -26312994024 |
| 7 | -411193252871529 |
| 8 | 32123650782112689116 |
| 9 | 12548365338592689141400286 |
| 10 | -24508500955561451477156078353144 |