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 | -1 |
| 2 | -1 |
| 3 | 5 |
| 4 | -5 |
| 5 | -6 |
| 6 | 11 |
| 7 | 41 |
| 8 | -125 |
| 9 | -85 |
| 10 | 1054 |
| 11 | -2069 |
| 12 | -209 |
| 13 | 8605 |
| 14 | -15625 |
| 15 | 3990 |
| 16 | 14035 |
| 17 | 36685 |
| 18 | -130525 |
| 19 | -254525 |
| 20 | 1899830 |
| 21 | -3603805 |
| 22 | -134905 |
| 23 | 13479425 |
| 24 | -25499225 |
| 25 | 23579969 |
| 26 | -64447293 |
| 27 | 237487433 |
| 28 | -133867445 |
| 29 | -1795846200 |
| 30 | 6309965146 |
| 31 | -6788705842 |
| 32 | -11762712973 |