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 | -3 |
| 2 | -5 |
| 3 | -105 |
| 4 | 81 |
| 5 | 6765 |
| 6 | 175747 |
| 7 | 30375 |
| 8 | 25219857 |
| 9 | 142901109 |
| 10 | 4548104883 |
| 11 | -31152650265 |
| 12 | -5198937484375 |
| 13 | 65230244418933 |
| 14 | -1300425712598285 |
| 15 | 126691467546591 |
| 16 | 868088125376401545 |
| 17 | -15139017417029296875 |