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 | -7 |
| 2 | -7 |
| 3 | 777 |
| 4 | 3129 |
| 5 | -342615 |
| 6 | -2965095 |
| 7 | 318612105 |
| 8 | 4810567545 |
| 9 | -504410403735 |
| 10 | -11895756971175 |
| 11 | 1209591806193225 |
| 12 | 41613411780711225 |
| 13 | -4074816146460117975 |
| 14 | -195459943548067129575 |
| 15 | 18284823353530418351625 |