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 | 16 |
| 2 | -802 |
| 3 | -46688 |
| 4 | 1798540 |
| 5 | 226360256 |
| 6 | -5892512504 |
| 7 | -1531215105152 |
| 8 | 19140505922192 |
| 9 | 13266452744761600 |
| 10 | 30007346525073376 |
| 11 | -139878952495176553984 |
| 12 | -2587288738781628813632 |
| 13 | 1734506561058255468362752 |
| 14 | 63337674290134610196498560 |
| 15 | -24678108393752726234245105664 |