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) |
|---|---|
| 1 | 0 |
| 2 | 9 |
| 3 | 198 |
| 4 | 3087 |
| 5 | 41976 |
| 6 | 530865 |
| 7 | 6419754 |
| 8 | 75308643 |
| 9 | 864197532 |
| 10 | -1358024589 |
| 11 | -123580236690 |
| 12 | -2345801446791 |
| 13 | 775432077543108 |
| 14 | 178553219976533007 |
| 15 | 27956332009875522906 |
| 16 | 3805734210999774512805 |
| 17 | 481583522109989673502704 |
| 18 | 58259362312008979572492603 |