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 | -3 |
| 4 | -1 |
| 5 | -1 |
| 6 | 16 |
| 7 | -25 |
| 8 | 278 |
| 9 | 3516 |
| 10 | -5012 |
| 11 | -30431 |
| 12 | -234676 |
| 13 | -4247453 |
| 14 | -6271957 |
| 15 | 177533446 |
| 16 | -416214476 |