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 | 8 |
| 2 | -56 |
| 3 | -568 |
| 4 | 3016 |
| 5 | 39368 |
| 6 | -153656 |
| 7 | -2673208 |
| 8 | 7160776 |
| 9 | 178246088 |
| 10 | -280043576 |
| 11 | -11687793208 |
| 12 | 6234995656 |
| 13 | 754253760968 |
| 14 | 355214038984 |
| 15 | -47917026662968 |
| 16 | -70650725157944 |
| 17 | 2996038981272008 |
| 18 | 7517685391380424 |
| 19 | -184228809410028088 |