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 | 2 |
| 2 | 2 |
| 3 | -4 |
| 4 | -26 |
| 5 | -68 |
| 6 | -76 |
| 7 | 184 |
| 8 | 1222 |
| 9 | 3308 |
| 10 | 3772 |
| 11 | -9656 |
| 12 | -64676 |
| 13 | -177448 |
| 14 | -203992 |
| 15 | 536176 |
| 16 | 3607622 |
| 17 | 9968972 |
| 18 | 11510636 |
| 19 | -30723416 |
| 20 | -207302156 |
| 21 | -575382392 |
| 22 | -666187432 |
| 23 | 1796105744 |
| 24 | 12142184476 |
| 25 | 33803271032 |