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 | 4 |
| 2 | -82 |
| 3 | -1112 |
| 4 | 19660 |
| 5 | 514544 |
| 6 | -7575224 |
| 7 | -332852768 |
| 8 | 3865192592 |
| 9 | 276417340480 |
| 10 | -2303430504224 |
| 11 | -280102715687296 |
| 12 | 1362687220804288 |
| 13 | 334851542531477248 |
| 14 | -396657349178753920 |
| 15 | -461002945749901799936 |
| 16 | -1260925479706838937344 |
| 17 | 717808917017018666550272 |