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 | -211 |
| 3 | 4241 |
| 4 | -57453709 |
| 5 | 29825987 |
| 6 | -7362684132917 |
| 7 | 198504470798947 |
| 8 | -415989828245529323 |
| 9 | 730328251215062341 |
| 10 | -628191544925589374756597 |
| 11 | 1131010588175721446183783 |
| 12 | -80125844020238574218022657310343 |