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 | -21 |
| 2 | 483 |
| 3 | -12075 |
| 4 | 325521 |
| 5 | -9396765 |
| 6 | 288749475 |
| 7 | -9398322675 |
| 8 | 322652227905 |
| 9 | -11641352627205 |
| 10 | 440043353374275 |
| 11 | -17378800976950875 |
| 12 | 715361536295492625 |
| 13 | -30625157300600587725 |
| 14 | 1360947531581394631875 |
| 15 | -62670194480910433291875 |