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 | -5 |
| 3 | -101 |
| 4 | 5293 |
| 5 | 869269 |
| 6 | -420787937 |
| 7 | -614362594985 |
| 8 | 2685998620138297 |
| 9 | 35251053957604379689 |
| 10 | -1387622522805833315933693 |
| 11 | -163878220402091372424795125261 |
| 12 | 58060742480730955957157145945031525 |
| 13 | 61711834213019891772066352604323845604861 |