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 | -9 |
| 3 | 59 |
| 4 | 981 |
| 5 | -11881 |
| 6 | -295029 |
| 7 | 5052179 |
| 8 | 167213961 |
| 9 | -3685319761 |
| 10 | -152462570049 |
| 11 | 4107372360299 |
| 12 | 203906790454941 |
| 13 | -6492149024819641 |
| 14 | -376012858170009069 |
| 15 | 13813635108523428419 |
| 16 | 914353480122881739921 |
| 17 | -38069496495248009807521 |