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 | 1 |
| 2 | -1 |
| 3 | -3 |
| 4 | -41 |
| 5 | -1035 |
| 6 | -40721 |
| 7 | -2291331 |
| 8 | -174783865 |
| 9 | -17394878523 |
| 10 | -2192620580129 |
| 11 | -341767803858867 |
| 12 | -64587124941406473 |
| 13 | -14555427555355014123 |
| 14 | -3857289820949315456817 |