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 | -14 |
| 2 | 124 |
| 3 | -1112 |
| 4 | 11504 |
| 5 | -121440 |
| 6 | 1235392 |
| 7 | -12400000 |
| 8 | 125394688 |
| 9 | -1274938880 |
| 10 | 12949806080 |
| 11 | -131304445952 |
| 12 | 1331250655232 |
| 13 | -13503545892864 |
| 14 | 136990201856000 |
| 15 | -1389579896979456 |
| 16 | 14094585311461376 |