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 | 0 |
| 2 | -2 |
| 3 | -8 |
| 4 | -26 |
| 5 | -80 |
| 6 | -268 |
| 7 | -944 |
| 8 | -3474 |
| 9 | -13072 |
| 10 | -49672 |
| 11 | -191272 |
| 12 | -744500 |
| 13 | -2924680 |
| 14 | -11596284 |
| 15 | -46364456 |