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 | -7 |
| 2 | -120 |
| 3 | 5383 |
| 4 | 77880 |
| 5 | -2948407 |
| 6 | -125323560 |
| 7 | 26616731351 |
| 8 | 376190322360 |
| 9 | -25686697799497 |
| 10 | -1814718336714600 |
| 11 | 302901133224550693 |
| 12 | 12839243232438424440 |
| 13 | -1266347767699067305987 |
| 14 | -125246840316843588099240 |
| 15 | 114029802259144841041647367 |
| 16 | 1611142488785956248768600120 |