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 | -10 |
| 3 | -1231 |
| 4 | 1636130 |
| 5 | 23957879562 |
| 6 | -3858392581773300 |
| 7 | -6835385537899011365535 |
| 8 | 133202313157282627679850238250 |
| 9 | 28553099061411464607955930776882965774 |