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 | 9 |
| 2 | 31 |
| 3 | -621 |
| 4 | -10239 |
| 5 | 32049 |
| 6 | 2848191 |
| 7 | 16019019 |
| 8 | -852695679 |
| 9 | -14081868711 |
| 10 | 256976237151 |
| 11 | 9353720489859 |
| 12 | -57153446024319 |
| 13 | -6126613308134271 |
| 14 | -17989779857401089 |
| 15 | 4126721296977379899 |
| 16 | 50632826565847235841 |
| 17 | -2845681598489278796631 |