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 | 0 |
| 2 | -1 |
| 3 | 5 |
| 4 | -469 |
| 5 | 6515 |
| 6 | -131672123 |
| 7 | 63427 |
| 8 | -47800416479 |
| 9 | 15112153995391 |
| 10 | -29632323552377537 |
| 11 | 4843119962464267 |
| 12 | -1882558877249847563479 |
| 13 | 2432942522372150087 |
| 14 | -2768809380553055597986831 |
| 15 | 334463513629004852735064113 |
| 16 | -1125061940756859461946444233539 |
| 17 | 333807583501528759350875247323 |