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 | -2 |
| 2 | -10 |
| 3 | 6 |
| 4 | 870 |
| 5 | 7878 |
| 6 | -90810 |
| 7 | -3599514 |
| 8 | -20802330 |
| 9 | 1466193798 |
| 10 | 42164160390 |
| 11 | -227736774234 |
| 12 | -44798359213530 |
| 13 | -896477167975482 |
| 14 | 32992662466363590 |
| 15 | 2308652347666959846 |
| 16 | 16747450938362727270 |
| 17 | -3885313022633595475962 |