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 | -1 |
| 3 | 157 |
| 4 | 65911 |
| 5 | -918227 |
| 6 | -234932171 |
| 7 | 592642957 |
| 8 | 149463069056137 |
| 9 | -16648792617135289 |
| 10 | -286497627060094895989 |
| 11 | 3538603031642540133299 |
| 12 | 57674522110226646157873673 |
| 13 | -713986824035720029666660757 |
| 14 | -6478234620955890989297122598683 |