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 | 2 |
| 3 | 0 |
| 4 | 17 |
| 5 | 29 |
| 6 | 1459 |
| 7 | -4233 |
| 8 | 1056763 |
| 9 | 11355763 |
| 10 | 6957281732 |
| 11 | -209598234798 |
| 12 | 410408244241271 |
| 13 | 37950250148465939 |
| 14 | 218184080600974976674 |
| 15 | -60068553848055713514168 |
| 16 | 1043447774597599997266176403 |
| 17 | 864004926526955255880635472763 |
| 18 | 44918734284964096829849186288888390 |